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All lessons in Technical SEO Auditing Lesson 4.6 of 84

Module 1: Introduction to Technical SEO Auditing

  1. 1.1What Is a Technical SEO Audit?
  2. 1.2Technical SEO Audit vs. General SEO Audit
  3. 1.3When Should You Audit a Website?
  4. 1.4Types of Technical SEO Issues
  5. 1.5Defining Audit Scope and Objectives

Module 2: Website Crawling and URL Discovery

  1. 2.1How SEO Crawlers Discover URLs
  2. 2.2Configuring a Website Crawl
  3. 2.3Crawl Scope, Limits, and Exclusions
  4. 2.4Internal Links and Crawl Depth
  5. 2.5Orphan Pages and URL Discovery
  6. 2.6Crawl Data vs. Search Engine Data
  7. 2.7Identifying Crawl Coverage Gaps

Module 3: HTTP Status Codes and Redirect Auditing

  1. 3.1Understanding HTTP Status Codes
  2. 3.2Finding 4xx Errors and Broken Links
  3. 3.3Identifying 5xx Server Errors
  4. 3.4Redirect Chains and Redirect Loops
  5. 3.5Internal Links to Redirected URLs
  6. 3.6301 vs. 302 Redirects
  7. 3.7Auditing 404 Pages and Soft 404s

Module 4: Crawlability and Indexability Auditing

  1. 4.1Crawling vs. Indexing
  2. 4.2Robots.txt Audit
  3. 4.3Meta Robots and X-Robots-Tag
  4. 4.4Noindex and Canonical Conflicts
  5. 4.5XML Sitemap Validation
  6. 4.6Canonical URL Auditing
  7. 4.7Identifying Indexability Conflicts
  8. 4.8Comparing Crawl Data with Google Search Console

Module 5: URL Structure and Duplicate Content Issues

  1. 5.1URL Structure and Normalization
  2. 5.2Duplicate URLs and Duplicate Pages
  3. 5.3HTTP vs. HTTPS and Hostname Variations
  4. 5.4Trailing Slashes and URL Parameters
  5. 5.5Pagination and Faceted Navigation
  6. 5.6Canonicalization Strategies
  7. 5.7Internal Linking to Preferred URLs

Module 6: Technical On-Page Auditing

  1. 6.1Missing and Duplicate Title Tags
  2. 6.2Missing and Duplicate Meta Descriptions
  3. 6.3Missing, Duplicate, and Multiple H1 Headings
  4. 6.4Heading Hierarchy and HTML Structure
  5. 6.5Missing Image Alt Attributes
  6. 6.6Internal Link and Anchor Text Issues
  7. 6.7Empty, Thin, and Near-Duplicate Pages
  8. 6.8Auditing HTML Metadata at Scale

Module 7: Website Performance and Core Web Vitals

  1. 7.1Core Web Vitals: LCP, INP, and CLS
  2. 7.2Lab Data vs. Field Data
  3. 7.3Identifying Slow Pages
  4. 7.4Image and Resource Optimization Opportunities
  5. 7.5JavaScript and CSS Performance
  6. 7.6Mobile Usability and Responsive Rendering
  7. 7.7Prioritizing Performance Fixes

Module 8: JavaScript SEO and Rendering

  1. 8.1How Search Engines Process JavaScript
  2. 8.2HTML Source vs. Rendered HTML
  3. 8.3Client-Side vs. Server-Side Rendering
  4. 8.4JavaScript-Generated Content and Links
  5. 8.5Rendering Failures and Missing Content
  6. 8.6Lazy Loading and Crawl Accessibility
  7. 8.7Diagnosing JavaScript SEO Problems

Module 9: Structured Data and Schema Auditing

  1. 9.1Structured Data and Schema.org Basics
  2. 9.2JSON-LD and Structured Data Formats
  3. 9.3Finding Structured Data Across a Website
  4. 9.4Detecting Invalid or Incomplete Markup
  5. 9.5Schema Validation and Rich Result Eligibility
  6. 9.6Conflicting or Duplicate Structured Data
  7. 9.7Prioritizing Schema Fixes

Module 10: Analyzing Audit Data and Prioritizing Issues

  1. 10.1Reading Crawl Reports and Exports
  2. 10.2Grouping URLs by Issue Type
  3. 10.3Identifying Root Causes vs. Symptoms
  4. 10.4Evaluating Severity, Impact, and Effort
  5. 10.5Separating Sitewide and Isolated Issues
  6. 10.6Identifying False Positives
  7. 10.7Building an Actionable Issue Register

Module 11: Technical SEO Audit Reporting

  1. 11.1Structuring a Technical SEO Audit Report
  2. 11.2Documenting Evidence and Affected URLs
  3. 11.3Writing Developer-Ready Recommendations
  4. 11.4Mapping Issues to Business and Search Impact
  5. 11.5Creating a Prioritized Remediation Roadmap
  6. 11.6Presenting Findings to Stakeholders
  7. 11.7Tracking Fixes and Ownership

Module 12: Fix Verification and Technical QA

  1. 12.1Re-Crawling After Fixes
  2. 12.2Comparing Before-and-After Crawl Results
  3. 12.3Verifying Redirects, Canonicals, and Indexability
  4. 12.4Detecting Regressions and Newly Introduced Issues
  5. 12.5Testing Website Changes Before Deployment
  6. 12.6Confirming Fixes with Search Console and Other Evidence
  7. 12.7Closing Audit Findings and Recording Results

Canonical URL Auditing

Your roadmap for this lesson

  • What a canonical tag does and does not do
  • The canonical problems to check in every audit
  • How to compare your canonical with Google's choice
  • Why Google sometimes ignores your canonical

Short answer

A canonical audit checks that every indexable page has a correct rel=canonical tag, usually pointing to itself, and that canonical targets are 200, indexable, and not redirected. Then compare your declared canonical with Google's selected canonical in URL Inspection, because Google treats canonicals as hints and may choose a different URL.

A Makati coworking space had the same “Day Pass” page at four URLs: with tracking parameters, with and without a trailing slash, and in a “promos” folder. Its canonical tags pointed to the promo version, which later redirected. Google picked the version it liked best, and it was not the one the business wanted.

What a canonical does

<link rel="canonical" href="https://www.example.ph/day-pass/">

It tells search engines which URL to index among duplicates and where to consolidate signals. It is a hint, not a command.

What to check

  1. Missing canonicals on indexable pages.
  2. Canonical targets that are not 200: redirects, 404s, 5xx.
  3. Targets that are noindexed or blocked.
  4. Canonical chains: A → B → C.
  5. Relative or wrong-host URLs: HTTP, non-www, staging domains.
  6. Multiple canonical tags on one page (often a theme plus a plugin).
  7. Canonical in rendered HTML differs from raw HTML (Module 8).

Your canonical vs. Google’s

In Search Console URL Inspection, compare User-declared canonical and Google-selected canonical. The Pages report also lists “Duplicate, Google chose different canonical than user.” If Google disagrees, align your other signals: internal links, sitemap URLs, redirects, and hreflang should all point to the same preferred URL.

Practice: healthy or broken canonical?

Sort each item into the right group.

  • Self-referencing canonical on a 200 indexable page

  • Canonical points to a URL that 301 redirects

  • Parameter URL canonical to the clean URL

  • Two different canonical tags on one page

  • Canonical points to the staging domain

  • Canonical target is noindexed

Common mistakes

  • Canonical everything to the homepage. Google ignores it, or worse, drops pages.
  • Canonicals that disagree with internal links and the sitemap.
  • Ignoring Google-selected canonical data. It shows whether your hints work.
1. Is a canonical tag a strict directive?
2. Where can you see the canonical Google chose?
3. A canonical points to a 301. What should you do?

Your action

Next, you will bring all signals together to identify indexability conflicts.

Key terms

rel=canonical
A link element telling search engines which URL is the preferred version among duplicates.
User-declared canonical
The canonical URL you set on the page.
Google-selected canonical
The URL Google actually chose as the main version, shown in URL Inspection.
Canonical chain
When page A canonicalizes to B, and B canonicalizes to C, creating an unclear signal.

Questions beginners ask

Is a canonical tag a directive?

No, it is a strong hint. Google weighs it with redirects, internal links, sitemaps, and content similarity before choosing.

Should every page have a canonical tag?

It is best practice for every indexable page to have a self-referencing canonical. It protects against parameter and tracking URL duplicates.

Why did Google choose a different canonical?

Usually because other signals disagree: internal links point elsewhere, the sitemap lists a different URL, or the pages are not truly duplicates.

Can a canonical point to another domain?

Yes, for syndicated content. Check that it is intentional, since a wrong cross-domain canonical can remove your page from results.

Related lessons

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