Technical SEO is the work of making a useful page consistently reachable, understandable, and indexable. It cannot rescue weak content, but technical mistakes can prevent strong content from being discovered at all.
Make one public URL the clear version
Choose HTTPS and one hostname, then redirect alternatives consistently. Each indexable page should return the expected status code and declare a canonical URL that matches the version you want visitors to use. Avoid chains where HTTP redirects to www, then another host, then a trailing-slash variant.
Check that important pages return 200 responses.
Redirect retired URLs to the closest useful replacement when one exists.
Use a real 404 response for pages that have no replacement.
Keep canonical URLs, internal links, and sitemap URLs consistent.
Control discovery deliberately
Robots.txt can prevent crawling, while a noindex directive can prevent indexing. They solve different problems. A sitemap is useful for discovery but does not guarantee inclusion in search results. Important content should also be reachable through ordinary internal links.
Avoid publishing empty category pages, internal search results, parameter combinations, or duplicate print versions as indexable pages unless they offer distinct value.
Give every page useful metadata
Write a descriptive page title that matches the actual content.
Use a unique meta description where a concise summary helps searchers.
Use one clear main heading and logical subheadings.
Add structured data only when it accurately represents visible page content.
Provide crawlable links with descriptive anchor text.
Monitor the live site
A technically correct local build can still fail after deployment because of DNS, authentication, CDN rules, server errors, or accidental noindex settings. Search Console URL Inspection and indexing reports are useful after launch because they show what Google actually encountered rather than what the repository intended.
Sources and further reading
Primary documentation and references used to support this guide.