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claude-skills-reference/marketing-skill/seo-audit/references/seo-audit-reference.md

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seo-audit reference

Audit Framework

Priority Order

  1. Crawlability & Indexation (can Google find and index it?)
  2. Technical Foundations (is the site fast and functional?)
  3. On-Page Optimization (is content optimized?)
  4. Content Quality (does it deserve to rank?)
  5. Authority & Links (does it have credibility?)

Technical SEO Audit

Crawlability

Robots.txt

  • Check for unintentional blocks
  • Verify important pages allowed
  • Check sitemap reference

XML Sitemap

  • Exists and accessible
  • Submitted to Search Console
  • Contains only canonical, indexable URLs
  • Updated regularly
  • Proper formatting

Site Architecture

  • Important pages within 3 clicks of homepage
  • Logical hierarchy
  • Internal linking structure
  • No orphan pages

Crawl Budget Issues (for large sites)

  • Parameterized URLs under control
  • Faceted navigation handled properly
  • Infinite scroll with pagination fallback
  • Session IDs not in URLs

Indexation

Index Status

  • site:domain.com check
  • Search Console coverage report
  • Compare indexed vs. expected

Indexation Issues

  • Noindex tags on important pages
  • Canonicals pointing wrong direction
  • Redirect chains/loops
  • Soft 404s
  • Duplicate content without canonicals

Canonicalization

  • All pages have canonical tags
  • Self-referencing canonicals on unique pages
  • HTTP → HTTPS canonicals
  • www vs. non-www consistency
  • Trailing slash consistency

Site Speed & Core Web Vitals

Core Web Vitals

  • LCP (Largest Contentful Paint): < 2.5s
  • INP (Interaction to Next Paint): < 200ms
  • CLS (Cumulative Layout Shift): < 0.1

Speed Factors

  • Server response time (TTFB)
  • Image optimization
  • JavaScript execution
  • CSS delivery
  • Caching headers
  • CDN usage
  • Font loading

Tools

  • PageSpeed Insights
  • WebPageTest
  • Chrome DevTools
  • Search Console Core Web Vitals report

Mobile-Friendliness

  • Responsive design (not separate m. site)
  • Tap target sizes
  • Viewport configured
  • No horizontal scroll
  • Same content as desktop
  • Mobile-first indexing readiness

Security & HTTPS

  • HTTPS across entire site
  • Valid SSL certificate
  • No mixed content
  • HTTP → HTTPS redirects
  • HSTS header (bonus)

URL Structure

  • Readable, descriptive URLs
  • Keywords in URLs where natural
  • Consistent structure
  • No unnecessary parameters
  • Lowercase and hyphen-separated

On-Page SEO Audit

Title Tags

Check for:

  • Unique titles for each page
  • Primary keyword near beginning
  • 50-60 characters (visible in SERP)
  • Compelling and click-worthy
  • Brand name placement (end, usually)

Common issues:

  • Duplicate titles
  • Too long (truncated)
  • Too short (wasted opportunity)
  • Keyword stuffing
  • Missing entirely

Meta Descriptions

Check for:

  • Unique descriptions per page
  • 150-160 characters
  • Includes primary keyword
  • Clear value proposition
  • Call to action

Common issues:

  • Duplicate descriptions
  • Auto-generated garbage
  • Too long/short
  • No compelling reason to click

Heading Structure

Check for:

  • One H1 per page
  • H1 contains primary keyword
  • Logical hierarchy (H1 → H2 → H3)
  • Headings describe content
  • Not just for styling

Common issues:

  • Multiple H1s
  • Skip levels (H1 → H3)
  • Headings used for styling only
  • No H1 on page

Content Optimization

Primary Page Content

  • Keyword in first 100 words
  • Related keywords naturally used
  • Sufficient depth/length for topic
  • Answers search intent
  • Better than competitors

Thin Content Issues

  • Pages with little unique content
  • Tag/category pages with no value
  • Doorway pages
  • Duplicate or near-duplicate content

Image Optimization

Check for:

  • Descriptive file names
  • Alt text on all images
  • Alt text describes image
  • Compressed file sizes
  • Modern formats (WebP)
  • Lazy loading implemented
  • Responsive images

Internal Linking

Check for:

  • Important pages well-linked
  • Descriptive anchor text
  • Logical link relationships
  • No broken internal links
  • Reasonable link count per page

Common issues:

  • Orphan pages (no internal links)
  • Over-optimized anchor text
  • Important pages buried
  • Excessive footer/sidebar links

Keyword Targeting

Per Page

  • Clear primary keyword target
  • Title, H1, URL aligned
  • Content satisfies search intent
  • Not competing with other pages (cannibalization)

Site-Wide

  • Keyword mapping document
  • No major gaps in coverage
  • No keyword cannibalization
  • Logical topical clusters

Content Quality Assessment

E-E-A-T Signals

Experience

  • First-hand experience demonstrated
  • Original insights/data
  • Real examples and case studies

Expertise

  • Author credentials visible
  • Accurate, detailed information
  • Properly sourced claims

Authoritativeness

  • Recognized in the space
  • Cited by others
  • Industry credentials

Trustworthiness

  • Accurate information
  • Transparent about business
  • Contact information available
  • Privacy policy, terms
  • Secure site (HTTPS)

Content Depth

  • Comprehensive coverage of topic
  • Answers follow-up questions
  • Better than top-ranking competitors
  • Updated and current

User Engagement Signals

  • Time on page
  • Bounce rate in context
  • Pages per session
  • Return visits

Common Issues by Site Type

SaaS/Product Sites

  • Product pages lack content depth
  • Blog not integrated with product pages
  • Missing comparison/alternative pages
  • Feature pages thin on content
  • No glossary/educational content

E-commerce

  • Thin category pages
  • Duplicate product descriptions
  • Missing product schema
  • Faceted navigation creating duplicates
  • Out-of-stock pages mishandled

Content/Blog Sites

  • Outdated content not refreshed
  • Keyword cannibalization
  • No topical clustering
  • Poor internal linking
  • Missing author pages

Local Business

  • Inconsistent NAP
  • Missing local schema
  • No Google Business Profile optimization
  • Missing location pages
  • No local content