Technical SEO is either invisible or catastrophic. This guide covers the categories we audit on every project and the fixes that actually move rankings.
Crawlability
Confirm the crawlers can access the pages you want indexed — check robots.txt, canonical tags and internal linking.
Indexation
Use GSC's Coverage report to spot excluded pages. Fix meta-noindex leaks, canonical loops and duplicate content.
Core Web Vitals
LCP under 2.5s, INP under 200ms, CLS under 0.1. Hosting and images move the needle most.
Schema
Article, Product, FAQ and Breadcrumb schema cover most content sites. Test with Google's Rich Results tool.
Site audits
Run Semrush Site Audit or Ahrefs Site Audit monthly; Screaming Frog for one-off deep dives.
Monitoring
GSC + a rank tracker + uptime monitoring covers the essential health signals.
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Frequently asked questions
What is technical SEO?
The set of on-site changes that help crawlers access, understand and rank your content.
Do I need a technical SEO tool?
Yes — Semrush, Ahrefs or SE Ranking's site audit covers most needs; Screaming Frog for deep crawls.
How often should I run a site audit?
Monthly for active sites, quarterly for stable ones.
Does Core Web Vitals matter for rankings?
Yes — but it's a rank tiebreaker, not the primary lever.