Technical SEO Fundamentals 2026: The Complete Guide
Technical SEO Fundamentals
Technical SEO ensures search engines can crawl, index, and rank your site effectively.
Core Web Vitals
LCP (Largest Contentful Paint): under 2.5 seconds. FID (First Input Delay): under 100 milliseconds. CLS (Cumulative Layout Shift): under 0.1. INP (Interaction to Next Paint): under 200 milliseconds. These are Google ranking factors.
Crawlability
Clean robots.txt file. XML sitemap submitted to Google Search Console. Logical site structure (3 clicks to any page). Internal linking between related pages. No orphan pages. Fix crawl errors promptly.
Indexation
Check index status in Google Search Console. Use noindex for thin or duplicate content. Canonical tags for duplicate pages. Hreflang for international sites. Rich results via structured data.
Site Speed
Optimize images (WebP format). Minimize CSS/JS. Use CDN. Enable browser caching. Lazy load images. Choose fast hosting. Test with PageSpeed Insights.