Optimize for search engine visibility and ranking. Use when asked to "improve SEO", "optimize for search", "fix meta tags", "add structured data", "sitemap optimization", or "search engine optimization".

SEO optimization Search engine optimization based on Lighthouse SEO audits and Google Search guidelines. Focus on technical SEO, on page optimization, and structured data. SEO fundamentals Search ranking factors (approximate influence): Factor Influence This Skill Content quality & relevance ~40% Partial (structure) Backlinks & authority ~25% ✗ Technical SEO ~15% ✓ Page experience (Core Web Vitals) ~10% See [Core Web Vitals](../core web vitals/SKILL.md) On page SEO ~10% ✓ Technical SEO Crawlability robots.txt: Meta robots: Canonical URLs: XML sitemap Sitemap best practices: Maximum 50,000 URLs or 50MB per sitemap Use sitemap index for larger sites Include only canonical, indexable URLs Update lastmod when content changes Submit to Google Search Console URL structure URL guidelines: Use hyphens, not underscores Lowercase only Keep short (< 75 characters) Include target keywords naturally Avoid parameters when possible Use HTTPS always HTTPS & security Security headers for SEO trust signals: On page SEO Title tags Title tag guidelines: 50 60 characters (Google truncates ~60) Primary keyword near the beginning Unique for every page Brand name at end (unless homepage) Action oriented when appropriate Meta descriptions Meta description guidelines: 150 160 characters Include primary keyword naturally Compelling call to action Unique for every page Matches page content Heading structure Heading guidelines: Single <h1 per page (the main topic) Logical hierarchy (don't skip levels) Include keywords naturally Descriptive, not generic Image SEO Image guidelines: Descriptive filenames with keywords Alt text describes the image content Compressed and properly sized WebP/AVIF with fallbacks Lazy load below fold images Internal linking Linking guidelines: Descriptive anchor text with keywords Link to relevant internal pages Reasonable number of links per page Fix broken links promptly Use breadcrumbs for hierarchy Structured data (JSON LD) Organization Article Product FAQ Breadcrumbs Validation Test structured data at: [Google Rich Results Test](https://search.google.com/test/rich results) [Schema.org Validator](https://validator.schema.org/) Mobile SEO Responsive design Tap targets Font sizes International SEO Hreflang tags Language declaration SEO audit checklist Critical [ ] HTTPS enabled [ ] robots.txt allows crawling [ ] No noindex on important pages [ ] Title tags present and unique [ ] Single <h1 per page High priority [ ] Meta descriptions present [ ] Sitemap submitted [ ] Canonical URLs set [ ] Mobile responsive [ ] Core Web Vitals passing Medium priority [ ] Structured data implemented [ ] Internal linking strategy [ ] Image alt text [ ] Descriptive URLs [ ] Breadcrumb navigation Ongoing [ ] Fix crawl errors in Search Console [ ] Update sitemap when content changes [ ] Monitor ranking changes [ ] Check for broken links [ ] Review Search Console insights Tools Tool Use Google Search Console Monitor indexing, fix issues Google PageSpeed Insights Performance + Core Web Vitals Rich Results Test Validate structured data Lighthouse Full SEO audit Screaming Frog Crawl analysis References [Google Search Central](https://developers.google.com/search) [Schema.org](https://schema.org/) [Core Web Vitals](../core web vitals/SKILL.md) [Web Quality Audit](../web quality audit/SKILL.md)

seo