Practical help guides mapped directly to scan checks.

SEO canonical_tag

Canonical Tag Missing — Duplicate Content Splitting SEO Authority

When multiple URLs serve the same content (with and without trailing slashes, query parameters, HTTP vs HTTPS), search engines either index all versions — wasting crawl budget and diluting rankings — or pick the wrong one as canonical. A single rel=canonical tag consolidates all link equity to the version you choose and prevents indexing bloat.

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SEO h1_tag

H1 Heading Missing or Duplicated

78% of advanced screen reader users navigate pages by headings (WebAIM Survey #10, 2024), so a missing or duplicated H1 directly impacts accessibility. For SEO, the H1 tells Google what the page is about. Without it, crawlers have to guess from surrounding content, which weakens your keyword relevance signals and dilutes page focus.

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SEO heading_structure

Heading Hierarchy Broken — H1 to H6 Structure Issues

88.8% of screen reader users find heading levels very or somewhat useful for page navigation (WebAIM Survey #10, 2024). When headings skip levels or are out of order, screen reader users can't build a mental map of your content structure. Search engines also use heading hierarchy to understand content relationships and assign keyword relevance.

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SEO hreflang

Hreflang Tags Missing or Incorrect — International SEO Issues

Sites with correct hreflang implementation see a 15-20% increase in international traffic and reduced bounce rates from international visitors (JEMSU, 2024). But 75% of hreflang implementations contain errors — 31% have conflicting directives and 16% are missing self-referencing tags (JEMSU). Bad hreflang is worse than no hreflang, so accuracy matters.

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SEO internal_links

Internal Linking Gaps — Orphaned Pages and Weak Authority Flow

URLs with 40-44 internal links receive 4x more Google traffic than URLs with 0-4 internal links (Internal Linking SEO study, 2024). A SearchPilot experiment found that expanding internal links yielded a 5% uplift in organic traffic to destination pages, with another project seeing a 9,500 weekly increase in organic visits within three weeks. Orphaned pages with no internal links stay invisible to both crawlers and users.

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SEO meta_description

Meta Description Missing or Poorly Optimised

Pages with optimised meta descriptions see up to 5.8% higher click-through rates, and using calls-to-action in descriptions can boost clicks by 20% (Webflow SEO research). Without a meta description, Google generates its own snippet from random page content — which rarely sells your page as well as you would. Keep descriptions between 120-155 characters for best results.

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SEO structured_data

Structured Data (Schema Markup) Missing — No Rich Results

Rich results account for 58% of clicks in search results, with FAQ schema achieving an average 87% CTR and product schema boosting clicks by 25% (Lantern Digital/Schema Markup Statistics, 2026). One case study showed a 20% CTR increase within 30 days of adding structured data, with overall traffic improving by 25% (SearchPilot). Without markup, you're invisible to rich result formats.

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SEO title_tag

Page Title Missing, Weak, or Being Rewritten by Google

Google rewrites 76% of title tags, retaining only 35% of the original title content on average (Zyppy/Search Engine Land, Q1 2025). Titles between 51-60 characters have the lowest rewrite rate at 39-42%, and matching your H1 to your title drops the rewrite rate to 20.6% (Portent). If Google is rewriting your titles, you've lost control of your search appearance.

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SEO twitter_card

Twitter/X Card Meta Tags Missing — Plain Links in Social

Rich social cards with images and descriptions get significantly more engagement than plain text links. Without Twitter card meta tags, every time someone shares your link, it appears as a bare URL with no preview — reducing clicks, shares, and the viral potential of your content. This applies to X/Twitter and many other platforms that read card markup.

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SEO sitemap

XML Sitemap Missing, Invalid, or Incomplete

Sitemaps help search engines use crawl budget more effectively by presenting a clear page hierarchy — especially critical for larger sites (Google Search Central). Without one, Google relies on link discovery alone, which means new pages, updated content, and deep pages may take weeks to get indexed. Note: Google ignores priority and changefreq values, so focus on accuracy and completeness.

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Performance caching

Browser Caching Headers Missing or Too Short

Google recommends a minimum cache lifetime of 30 days for all cacheable subresources, with one week as the absolute minimum and one year recommended for static assets (Chrome DevTools Lighthouse). Without caching headers, every return visit downloads your CSS, JavaScript, images, and fonts from scratch — wasting bandwidth and making your site feel slow for your most engaged users.

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