How to Perform a Complete SEO Audit: A Step-by-Step Guide

1. What Is an SEO Audit?

An SEO audit is a structured assessment of the factors that influence a website's ability to be discovered, understood, indexed, and selected in organic search results. It also considers whether the website provides a useful experience once a visitor arrives.

A good audit does not simply produce a list of warnings from an SEO tool. It connects each finding to a real page, explains the likely impact, identifies the cause where possible, and recommends a practical fix.

The main areas of an SEO audit

• Technical SEO: Server responses, redirects, HTTPS, crawlability, indexability, canonicalization, XML sitemaps, and rendering.
• On-page SEO: Titles, meta descriptions, headings, URLs, image alt text, and content relevance.
• Content quality: Search intent, usefulness, accuracy, topical coverage, outdated information, duplication, and content gaps.
• Site architecture: Navigation, category structure, URL hierarchy, and the paths connecting important pages.
• Authority and links: Internal links, external backlinks, referring domains, and suspicious link patterns.
• Page experience: Mobile usability, Core Web Vitals, readability, accessibility considerations, and intrusive interface elements.
• Measurement: Organic landing pages, search queries, conversions, and the ability to measure changes after implementation.

The objective is not to achieve a perfect score in every SEO tool. Different tools use different crawlers, rules, and thresholds. The objective is to identify the problems that matter to your website and fix them in a sensible order.

2. Prepare Before You Start the SEO Audit

Begin by defining the website's purpose and the outcomes that matter. An online store, a local service business, a SaaS company, and an informational blog may use the same auditing principles, but their most important pages and conversion goals will differ.

Step 1: Define the website's objectives

Identify the pages that directly support business outcomes. For an ecommerce website, these may include product and category pages. For a B2B SaaS company, they may include product pages, feature comparisons, use cases, and demo pages. A publisher may prioritize informational articles, category pages, and newsletter sign-ups.

Step 2: Establish a performance baseline

Before making changes, record current performance so you can compare results later. Use Google Search Console for impressions, clicks, click-through rate, average position, and indexing information. Use Google Analytics 4 to examine landing-page sessions and meaningful conversion events when tracking is configured correctly.

Compare an appropriate recent period with a previous period, and consider seasonal patterns. A decline in traffic is not automatically evidence of a technical SEO problem; demand, competition, search-result changes, and tracking issues can also influence the numbers.

Step 3: Crawl the website

Use a crawler to collect URLs and inspect status codes, titles, descriptions, headings, canonical tags, indexability directives, internal links, and other page-level signals. Start with the main domain and include relevant subdomains only if they are part of the audit scope.

For a small website, a manual review of important pages may be enough to get started. For a larger website, a crawl helps reveal patterns that would be difficult to detect by checking URLs individually.

Step 4: Create an audit spreadsheet

Record each finding in a consistent format. Useful columns include:

• Issue ID and affected URL
• Audit category
• Observed problem and supporting evidence
• Likely cause and recommended fix
• Priority and estimated effort
• Assigned owner and status
• Validation method and completion date

3. Perform a Technical SEO Audit

Technical SEO determines whether search engines can access the website, interpret its important resources, and process its URLs correctly. Start with issues that could prevent valuable pages from being crawled or indexed.

Check HTTPS and preferred domain versions

Confirm that the website uses HTTPS and that alternative versions of the domain resolve consistently. For example, the HTTP version, HTTPS version, www version, and non-www version should not create confusing competing versions of the same content.

Review redirects to ensure they point to the preferred destination and avoid unnecessary redirect chains. A redirect should lead users and crawlers to the intended replacement page, not to an unrelated URL or a loop.

Review status codes

HTTP status codes communicate what happened when a URL was requested. Review them in the context of the page's purpose rather than treating every non-200 response as a problem.

Do not redirect every deleted page to the homepage. When there is no meaningful replacement, an appropriate 404 or 410 response may be more accurate than a misleading redirect.

Inspect robots.txt

Check the site's robots.txt file, normally available at https://example.com/robots.txt. Look for rules that unintentionally block important page paths or resources needed to render content.

Remember that robots.txt is primarily a crawling control, not a reliable method for removing a URL from Google's index. A blocked URL may still be known to Google through links or other signals. If a page should not appear in search results, use an appropriate indexing control and make sure search engines can crawl the page to see it.

Check for mixed content and rendering problems

Inspect key pages in a browser and test whether important scripts, stylesheets, images, and page content load correctly. A page that looks normal to a visitor can still have rendering problems if essential resources fail or the content depends on interactions that crawlers cannot reliably process.

Review JavaScript-heavy pages with both a browser and Google Search Console's live URL test where relevant. Investigate differences between the intended page and what Google can retrieve and render.

Check for accidental sitewide blocks

On WordPress websites, verify that the search engine visibility setting is not configured to discourage indexing when the site should be public. Also inspect SEO plugin settings, page-level robots directives, template-level settings, and staging-site leftovers.

Technical issues should be validated on the live website after a fix. A configuration that looks correct in the WordPress dashboard does not prove that the correct directives or responses are being served to search engines.

4. Audit Crawling, Indexing, and Canonical URLs

A page can be accessible in a browser without being indexed by Google. Crawling, indexing, and ranking are separate stages. Your audit should establish whether important URLs can be crawled, whether they are eligible for indexing, and whether Google has selected the intended canonical URL.

Use Google Search Console

Open the Google Search Console property for the correct website. Review the Page Indexing report and investigate patterns in excluded URLs instead of treating every exclusion as an error.

For individual pages, use the URL Inspection tool. It helps you examine Google's indexed information and test the live URL for issues that may affect eligibility for indexing.

Investigate common indexing statuses

• Discovered — currently not indexed: Google knows about the URL but has not indexed it. Review internal links, content value, crawl patterns, and server reliability.
• Crawled — currently not indexed: Google crawled the page but has not included it in the index. Review its usefulness, originality, duplication, and overall quality. The status alone does not reveal a single definitive cause.
• Duplicate without user-selected canonical: Google detected a duplicate and selected a canonical URL. Check whether the chosen version is appropriate.
• Alternate page with proper canonical: This may be expected if the URL intentionally points to another canonical version.
• Excluded by noindex: Confirm whether the exclusion was intentional. Remove the directive only if the page should be eligible for indexing.
• Blocked by robots.txt: Determine whether the restriction is necessary and whether Google needs access to crawl the page.

Review XML sitemaps

Your XML sitemap should help search engines discover the URLs you want considered for indexing. Check that it is accessible, submitted where appropriate in Search Console, and free from unintended staging URLs, broken destinations, and unnecessary redirected URLs.

For most content websites, sitemap entries should focus on preferred, canonical URLs that return successful responses and are intended to be indexed. Sitemap inclusion is a discovery signal, not a guarantee of indexing or ranking.

Verify canonical tags

A canonical tag communicates which URL should be treated as the preferred version of duplicate or substantially similar content. Inspect canonical tags for important pages and compare them with redirects, internal links, sitemap URLs, and the page's actual purpose.

Look for common mistakes such as a blog post canonicalizing to the homepage, multiple pages pointing to the same unrelated canonical, or a canonical pointing to a URL that redirects or returns an error.

Do not use canonical tags as a substitute for removing accidental duplicates or configuring redirects where a URL has permanently moved. Each mechanism has a different purpose.

5. Review Site Architecture and URL Structure

A well-organized website helps visitors find information and gives search engines useful clues about relationships between pages. An architecture audit examines navigation, category organization, URL patterns, and the number of steps required to reach important content.

Inspect the main navigation

Check whether the navigation reflects the website's actual topics and user journeys. Important service pages, product categories, learning resources, and contact options should be easy to locate. Remove confusing duplicate links and investigate menu items that lead to obsolete pages.

Check category and topic structure

Group related content in a logical way. For example, a digital marketing website may organize resources around SEO, content marketing, marketing automation, and software reviews. Each category should have a clear purpose rather than existing only to accommodate a keyword.

Review category archive pages for useful introductions, logical pagination, accessible article links, and duplicate or empty archives. Thin archives may need better organization or a different indexing strategy depending on their purpose.

Audit URLs

Descriptive URLs are generally easier for people to understand than random identifiers or unnecessarily complex strings. Review URLs for inconsistent capitalization, confusing parameters, duplicate paths, and outdated slugs.

Avoid changing established URLs simply to make them shorter. If a URL already serves users and earns search visibility, a change should have a clear benefit and an appropriate redirect plan.

Find orphan pages

An orphan page is a page with no internal links from the pages included in your crawl. It may still be accessible through a sitemap or external link, but visitors may have difficulty discovering it through the site's navigation.

Compare your crawler's URL list with the sitemap, Search Console landing pages, and known important URLs. Investigate pages that receive impressions or conversions but are missing from the site's internal linking structure.

6. Conduct an On-Page SEO Audit

On-page SEO helps search engines and visitors understand what each page offers. The goal is to make the subject, purpose, and value of the page clear without forcing keywords into every available element.

Review title tags

Each important page should have a descriptive, relevant title that distinguishes it from other pages on the website. Check for missing titles, duplicated titles, vague wording, and titles that promise something the page does not deliver.

Include the primary topic naturally when it helps describe the page. There is no universal character count that guarantees Google will display the full title; display depends on several factors, including the available width and the search result context.

Improve meta descriptions

A useful meta description summarizes the page and gives a searcher a reason to consider visiting it. Review descriptions for important landing pages, especially where impressions are strong but click-through rates may indicate an opportunity to improve the search snippet.

Google may generate a different snippet from page content when it considers that text more relevant to a query. Treat the meta description as a helpful summary, not a guarantee that the exact wording will appear in search results.

Check heading structure

Review the main heading and supporting subheadings. The H1 should communicate the page's central topic, while H2 and H3 headings should organize the material in a logical hierarchy.

Do not focus on hitting an arbitrary number of headings or keywords. A page should have enough structure to help readers navigate it, and decorative design elements should not create confusing heading sequences.

Evaluate keyword targeting and search intent

Compare each page with the searches it is intended to serve. A person searching for an explanation may want a detailed guide, while someone searching for a software comparison may expect features, limitations, pricing information, and a recommendation.

Check whether the page answers the main question early, uses related terminology naturally, and provides the information visitors reasonably expect. If several pages target the same intent and compete for the same queries, examine whether they should be differentiated, consolidated, or linked more strategically.

Review images and media

• Use descriptive filenames where practical.
• Write meaningful alternative text for informative images.
• Use empty alt text for purely decorative images where appropriate.
• Compress images and serve dimensions appropriate to their display size.
• Check that important images load correctly on mobile devices.
• Make sure charts and screenshots are accompanied by explanations when their meaning is important.

Inspect page-level metadata

Where relevant, check canonical tags, robots directives, language settings, social-sharing metadata, and breadcrumb markup. These elements should reflect the page's actual purpose and preferred URL rather than being copied blindly across every page template.

7. Audit Content Quality and Topical Coverage

Content issues can be harder to detect than broken links because a page may return a successful status and still fail to meet users' needs. A content audit evaluates usefulness, accuracy, intent, originality, and the role each page plays in the website's overall structure.

Find pages with declining organic performance

Use Search Console to identify pages whose clicks or impressions have declined. Compare equivalent periods, examine query-level data, and consider changes in demand and search results before deciding that a page needs a rewrite.

Pages with substantial impressions but low click-through rates may need better titles, clearer positioning, or a closer match to search intent. Pages that attract clicks but do not generate meaningful engagement may have a content or conversion problem rather than a visibility problem.

Identify outdated information

Review articles that contain outdated screenshots, obsolete tool instructions, discontinued features, inaccurate statistics, or broken references. Update material when there is a real reason to do so, and verify factual claims against reliable sources.

Changing a publication or modification date without materially improving the content is not a substitute for a useful update.

Look for thin or overlapping pages

Pages with little unique value may not justify their place in the website's structure. Similarly, multiple articles that answer almost the same question can create an unclear experience for readers.

Do not automatically delete short pages or combine every related article. A concise page can satisfy a specific need, and similar topics can serve different search intents. Examine actual content, performance, links, and business value before choosing an action.

Use a content decision framework

Demonstrate experience and reliability

Strong content explains how conclusions were reached. Add original examples, screenshots, comparisons, limitations, and transparent methodology where they improve the reader's understanding. Cite credible sources for claims that need verification.

For software reviews, distinguish hands-on testing from research based on publicly available documentation. For technical tutorials, verify that the described workflow still works. For financial, medical, legal, or other sensitive subjects, apply appropriate expert review and caution.

Google's guidance emphasizes useful, reliable, people-first content. Read its guidance on creating helpful, reliable, people-first content when evaluating the quality of important pages.

8. Audit Internal Links

Internal links connect pages within the same website. They help users discover related resources and help search engines understand relationships between pages. A useful internal linking structure supports navigation and makes important content easier to find.

Identify broken internal links

Use a crawler to locate internal links pointing to missing pages, redirect chains, or unintended destinations. Fix the source link where possible. If a destination has permanently moved, update links to point directly to the preferred URL.

Check links to important pages

Review whether key commercial pages, cornerstone guides, and high-value resources receive relevant links from related content. A useful link should make sense to the reader and provide a clear path to additional information.

Improve anchor text

Anchor text should describe the destination in natural language. Generic anchors such as “click here” can be less informative than a contextual phrase, although they may still be appropriate in some interfaces.

Avoid repeating exact-match commercial keywords in every internal link. Excessive, unnatural anchor patterns can create a poor user experience and may look manipulative.

Build topic clusters thoughtfully

A topic cluster connects a central resource with related supporting articles. For example, a comprehensive SEO audit guide could link to separate guides on technical SEO, keyword research, internal linking, and performance optimization.

The central page should provide a useful overview, while supporting articles should answer more specific questions. Link between them where the relationship helps readers, not simply to meet an arbitrary link count.

9. Review the Backlink Profile

Backlinks are links from other websites to yours. A backlink audit helps you understand which external pages reference your content, which pages attract links, and whether there are patterns that deserve investigation.

Assess referring domains and linked pages

Use an SEO platform such as Ahrefs, Semrush, or another backlink analysis tool to examine referring domains, linked URLs, anchor text, and the pages receiving links. Compare these findings with the content you want to strengthen.

Focus on relevance, context, and editorial value rather than treating raw link counts as a measure of quality. A small number of genuinely relevant references can be more useful than a large collection of low-value links.

Investigate suspicious link patterns carefully

Look for evidence of manipulative link schemes, such as large-scale paid links intended to influence rankings, automated link creation, or unrelated link placements with no editorial value. However, a strange-looking domain or a tool's low authority score does not by itself prove that a link is harmful.

Do not disavow backlinks automatically because a third-party tool labels them toxic. Google's documentation explains that most sites do not need the disavow tool. Consider it only when there is a substantial pattern of artificial or low-quality links and a relevant reason to believe they may result in a manual action.

Read Google's Search spam policies and guidance on the disavow links tool before taking action.

Find opportunities to earn relevant links

Identify useful resources that other publishers may want to reference: original research, practical templates, unique case studies, well-documented tutorials, and genuinely helpful tools. Outreach should explain why the resource benefits the recipient's audience.

A backlink audit is not a mandate to build links at any cost. Prioritize the content and relationships that make sense for your industry and audience.

10. Test Website Performance and Mobile User Experience

Slow pages, unstable layouts, and unresponsive controls can frustrate visitors. Performance testing helps identify bottlenecks, but a single lab score should not be treated as a complete representation of every user's experience.

Measure Core Web Vitals

Google's Core Web Vitals evaluate loading performance, responsiveness, and visual stability. The commonly used good thresholds are:

These thresholds are assessed at the 75th percentile of real user visits, segmented by mobile and desktop. Where field data is available, it provides a valuable view of real-world performance.

Use PageSpeed Insights to inspect individual URLs and Search Console to review available Core Web Vitals reports.

Investigate common performance problems

• Oversized or poorly compressed images.
• Slow server response or inefficient database queries.
• Excessive JavaScript or CSS that delays rendering.
• Unnecessary plugins, third-party scripts, and tracking tags.
• Web fonts that block text rendering or cause layout shifts.
• Missing image dimensions that allow content to jump during loading.
• Cache settings that fail to serve repeat visits efficiently.

Apply changes carefully and retest the actual page. Minifying CSS, enabling caching, or installing another optimization plugin will not automatically solve every performance issue. Plugin conflicts, incorrect exclusions, and overloaded hosting can undermine the expected gains.

Test mobile usability manually

Open representative pages on a mobile device or use browser responsive mode. Confirm that text is readable, navigation works, buttons are easy to tap, forms are usable, and important information is not hidden behind intrusive overlays.

Check that the mobile page presents the important content and links that users need. A responsive layout is not sufficient if the main call to action is inaccessible or key content disappears.

11. Validate Structured Data and Search Appearance

Structured data provides machine-readable information about page content. Depending on the page and supported search features, it can help Google understand entities such as products, articles, organizations, breadcrumbs, and other supported content types.

Check whether structured data is appropriate

Review the markup on important templates and confirm that the chosen schema type accurately represents the visible content. For example, an article may use Article or BlogPosting markup, while a genuine product page may use Product markup when its requirements are satisfied.

Do not add schema types solely because an SEO plugin offers them. The markup should describe what the page actually contains and follow Google's eligibility requirements for the relevant search feature.

Test for errors and misleading properties

Use Google's Rich Results Test for supported rich result types. Also inspect the URL in Search Console for structured data reports where available.

Look for invalid required properties, incorrect URLs, mismatches between markup and visible content, and review or rating information that is not genuinely supported. Valid markup does not guarantee that a rich result will be shown.

On WordPress, check whether the theme and SEO plugins are generating overlapping schema. Avoid adding a second, conflicting schema graph just to increase the number of detected items.

12. Compare Keywords and Search Competitors

An SEO audit should examine how your website performs in its competitive environment. This does not mean copying competitor pages. It means understanding what searchers expect, which topics competing pages address, and where your website can provide something more useful.

Review actual search queries

Use Search Console to identify queries that generate impressions, clicks, and changes in visibility. Group related queries by intent, then map them to the most relevant landing pages.

Look for relevant queries where a page receives impressions but appears to answer only part of the searcher's question. This may indicate an opportunity to improve the page, clarify its purpose, or create a separate resource for a genuinely different intent.

Analyze relevant competing pages

Identify the pages that consistently appear for your target queries. Review their topic coverage, page structure, supporting evidence, user experience, and content format. Search competitors may differ from your direct business competitors, so use the results for the specific query rather than relying only on brand names.

Find content gaps

Look for useful questions that your audience asks but your website does not answer well. A content gap should be based on user needs and topical relevance, not simply on a competitor publishing more articles.

Prioritize topics where your website has a credible reason to contribute. Original testing, specialist knowledge, clear explanations, and useful resources are stronger foundations than producing near-identical pages for every keyword variation.

Check keyword cannibalization claims carefully

When multiple pages appear for similar queries, investigate whether they serve different intents and whether their performance is actually being impaired. Multiple URLs appearing for a related topic are not automatically a problem.

If pages genuinely overlap, consider improving differentiation, clarifying internal links, or consolidating content when that is the best experience for readers. Preserve valuable URLs and plan redirects when pages are permanently combined.

13. Audit Analytics and Conversion Paths

Organic traffic is useful only when it supports the website's goals. A complete audit examines whether visitors can take the next step and whether analytics accurately records those actions.

Review organic landing pages

In Google Analytics 4, examine landing pages associated with organic search traffic. Look beyond total sessions to understand engagement, relevant events, and conversions that reflect the site's objectives.

Compare landing-page performance with Search Console data, keeping in mind that the platforms measure and attribute activity differently. Differences between the reports do not automatically indicate a tracking failure.

Test important conversion paths

Visit key pages as a real user. Test forms, contact links, newsletter sign-ups, demo requests, purchase steps, or phone links where relevant. Check that the call to action is visible, the next step is clear, and the destination works on mobile.

Validate conversion tracking

Confirm that important events are recorded correctly and are not double-counted. Test the full journey from landing page to completion, and verify that tracking changes have not broken event names, consent behavior, or attribution.

When a page attracts organic visitors but produces few meaningful actions, investigate whether the intent, offer, messaging, usability, and audience match the goal. The solution may be a better page experience rather than more keywords.

14. SEO Audit Tools: What to Use and Why

You do not need every SEO platform to perform a useful audit. Choose tools according to the questions you need to answer, the size of the website, and your available budget.

Tool coverage and features can change, and some functions require paid plans. Confirm the current limits before choosing a platform. Most importantly, use the tool that provides the evidence needed to answer the audit question rather than collecting reports that will never inform a decision.

15. Prioritize SEO Audit Findings

One of the most common audit mistakes is treating every warning as equally important. A missing canonical on a high-value landing page may deserve immediate attention, while a minor heading inconsistency on a low-traffic page may have little practical impact.

Prioritize issues using four considerations:

• Impact: Could the issue prevent important pages from being crawled, indexed, understood, or used successfully?
• Scope: Does it affect one URL, a template, a category, or the entire website?
• Evidence: Can you verify the issue and connect it to a real problem?
• Effort: How much time, coordination, or development work will the fix require?

These are practical working categories, not official Google classifications. Adjust them to reflect the website's business model, risk, and available resources.

Create an actionable implementation plan

For every high-priority issue, document the evidence, affected URLs, responsible person, proposed fix, and validation step. After implementation, rerun the relevant tests rather than assuming that closing a development task means the issue has been resolved.

Keep the original crawl and record subsequent changes. Review Search Console and analytics over an appropriate period to determine whether the fix was followed by the expected improvement. SEO results are affected by many factors, so avoid attributing every traffic change to a single edit without supporting evidence.

16. Complete SEO Audit Checklist

Use this checklist as a final review of the website. Mark an item complete only after you have checked the relevant evidence.

Technical SEO

• HTTPS works correctly, and preferred domain versions are consistent.
• Important pages return the intended HTTP status codes.
• Redirects are relevant and do not create unnecessary chains or loops.
• Robots.txt does not unintentionally block important resources or URLs.
• No accidental sitewide or page-level noindex directives are present.
• Important pages render correctly in a browser and can be tested by Google.

Crawling and indexing

• Search Console indexing patterns have been reviewed.
• Important URLs have been inspected individually where necessary.
• The XML sitemap is accessible and contains appropriate preferred URLs.
• Canonical tags point to the intended versions of pages.
• Duplicate URLs and obsolete pages have an appropriate handling strategy.

On-page SEO and content

• Important pages have descriptive titles and useful meta descriptions.
• Main headings and subheadings communicate the content clearly.
• Content matches the intended search intent and provides useful answers.
• Outdated information, broken references, and inaccurate claims have been checked.
• Images have appropriate alternative text and optimized file sizes.
• Overlapping pages and content gaps have been investigated.

Links and architecture

• Main navigation and category structures are logical.
• Important pages are reachable through relevant internal links.
• Broken internal links and unnecessary redirecting links have been reviewed.
• Anchor text is descriptive and natural.
• Backlink patterns and referring pages have been evaluated carefully.

Performance and measurement

• Core Web Vitals have been reviewed where data is available.
• Representative pages have been tested on mobile devices.
• Slow loading, layout shifts, and interaction problems have been investigated.
• Analytics and important conversion events have been validated.
• Findings are recorded with priorities, owners, and validation steps.

17. Common SEO Audit Mistakes to Avoid

Fixing every tool warning without checking its impact

Automated audits are useful for discovering patterns, but a warning does not always mean a problem exists. Review the affected URL, understand the tool's rule, and verify whether the finding matters for your website.

Changing URLs without a migration plan

Changing established URLs can affect internal links, external links, user bookmarks, and search engine processing. Keep URLs stable when possible. When a change is necessary, map old URLs to relevant destinations and test redirects after launch.

Deleting content based only on traffic

A page with low organic traffic may still support customers, answer an important question, earn valuable links, or assist conversions. Consider its purpose and evidence before removing it.

Adding keywords unnaturally

Repeating an exact-match keyword in every heading, image name, and paragraph does not make a page more useful. Use language that explains the topic clearly and covers the questions readers genuinely have.

Ignoring the technical cause

Rewriting an article will not resolve a sitewide robots directive, and compressing images will not fix a broken canonical tag. Match the remedy to the verified cause.

Expecting immediate ranking improvements

Some corrections can be reflected quickly, while other changes require recrawling, reprocessing, and time for performance trends to become meaningful. There is no universal timeline or guaranteed ranking improvement after an audit.

Failing to retest after implementation

Changes to templates, plugins, redirects, caching, and indexing settings can introduce new issues. Validate important fixes on the live website and retain evidence of the result.

Frequently Asked Questions About SEO Audits

Official SEO References and Further Reading

Use these primary sources to verify technical recommendations and explore the relevant documentation in more detail.

• Google Search Central: SEO Starter Guide — foundational SEO practices, site organization, URLs, and content.
• Google Search Central: Overview of Google Crawlers — how Google discovers and crawls pages.
• Google Search Console: URL Inspection Tool — indexing information and live URL testing.
• Google Search Central: Consolidate Duplicate URLs — canonicalization and duplicate URL handling.
• Google Search Central: Core Web Vitals — performance metrics and their relationship to Search.
• Google Search Central: Introduction to Structured Data — supported markup principles and implementation guidance.
• Google Search Essentials: Spam Policies — practices that may violate Google's spam policies.
• Google Search Central: Creating Helpful, Reliable, People-First Content — guidance for evaluating content usefulness and reliability.
• Google Search Console Help: Disavow Links — when and how to consider the disavow tool.

This guide is educational and describes general SEO practices. Audit findings and appropriate fixes depend on the website's configuration, content, goals, and available evidence. Always test consequential technical changes before and after implementation.