Make important pages accessible, consistent and understandable.
Search engines need stable URLs, sensible internal links, correct status codes and content that can be rendered without unnecessary technical barriers.
This guide is written to support real implementation decisions rather than provide a generic checklist.
Key points to understand
Important pages need crawlable links and a coherent site architecture rather than relying on scripts or orphaned URLs.
Canonical signals and HTTP responses should clearly communicate which URLs are valid, redirected, duplicated or unavailable.
JavaScript can be indexed, but critical content and navigation should not depend on fragile client-side behaviour when robust server-side output is practical.
Diagnose technical SEO as a system, not a checklist.
The useful question is whether technical behaviour supports search discovery and user experience across the site.
Useful checksCrawl paths to important pages · Canonical consistency · Redirect and status-code behaviour · Rendered HTML for critical content
Common mistakesBlocking resources needed for rendering · Using noindex and robots.txt interchangeably · Canonicalising unrelated pages together · Hiding key links behind client-only interactions