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All lessons in Technical SEO Auditing Lesson 5.4 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

Trailing Slashes and URL Parameters

Covered here

  • Why /page and /page/ can be two URLs
  • The main types of URL parameters
  • How to list every parameter on a site
  • Which handling fits each parameter type

Short answer

A trailing slash and its absence create two URLs, so one format should return 200 and the other should 301 to it. URL parameters add variations for tracking, sorting, filtering, and pagination. List every parameter in your crawl, then canonicalize, redirect, block, or keep each type based on whether it changes the page's main content.

A Laguna bike shop’s crawl showed 18,000 URLs for 600 products. The extra 17,000 came from four parameters: ?sort=, ?view=grid, ?sessionid=, and ?utm_campaign=, plus a missing trailing slash rule. Small URL details, multiplied across a site, become thousands of duplicates.

Trailing slashes

/rooms and /rooms/ are technically different URLs. Check:

  • One returns 200, the other 301s to it.
  • Internal links, canonicals, and sitemaps use the 200 version.
  • Redirects do not loop between a CMS rule and a server rule.

Types of parameters

TypeExampleChanges content?Typical handling
Tracking?utm_source=fbNoSelf-canonical on clean URL, never link internally
Session?sessionid=abcNoRemove from URLs, use cookies
Sorting / view?sort=priceOrder onlyCanonical to clean URL, consider blocking
Filtering?color=redYesDepends: see faceted navigation (Lesson 5.5)
Pagination?page=2YesIndexable, self-canonical
Search?q=shoesYesUsually noindex or blocked

How to audit

  1. Filter your crawl for URLs containing ? and export them.
  2. Split out parameter names (a spreadsheet split on ? and & works) and count URLs per parameter.
  3. For each parameter, record: type, URL count, canonical behavior, internal link sources.
  4. Check Search Console for indexed parameter URLs.

Practice: what kind of parameter?

Sort each item into the right group.

  • ?utm_medium=email

  • ?page=3

  • ?sessionid=8812a

  • ?brand=trek

  • ?ref=homepage-banner

Common mistakes

  • Internal links with tracking parameters. Creates crawlable duplicates.
  • Blocking parameters that carry canonicals. Google cannot see them.
  • Canonicalizing pagination to page 1. Hides products on later pages.
1. /blog and /blog/ both return 200. What should happen?
2. How should UTM-tagged URLs be handled?
3. Pagination parameters usually should be...

Your action

Next, you will audit pagination and faceted navigation.

Key terms

Trailing slash
The / at the end of a URL path, as in /rooms/ versus /rooms.
URL parameter
A key and value after a ? in a URL, such as ?color=red or ?utm_source=fb.
Active parameter
A parameter that changes page content, such as filters or pagination.
Passive parameter
A parameter that does not change content, such as tracking or session IDs.

Questions beginners ask

Is a trailing slash better for SEO?

No. Consistency matters, not the choice. Match whatever your CMS uses by default and redirect the other.

Should I block parameters in robots.txt?

Only for parameters that create huge numbers of useless URLs, such as sort orders or session IDs. Blocking prevents Google from seeing canonicals on those URLs.

Do UTM parameters hurt SEO?

Not if pages have self-referencing canonicals and you never use UTMs in internal links.

Does Google still have a URL Parameters tool?

No. It was retired in 2022. You manage parameters with canonicals, links, robots.txt, and consistent site design.

Related lessons

Want someone to handle SEO for your business while you learn? The team at Remar Digital can help.