Technical SEO
Technical SEO is the discipline of making a website crawlable, indexable and fast to render. It covers crawl management, indexation, site speed, structured data, HTTPS and mobile rendering, and it forms the foundation that everything else in search is built upon.
Why it matters for your rankings
Technical SEO is a multiplier rather than a driver. It rarely wins rankings by itself, but every technical fault caps what your content and links can achieve, often invisibly.
That asymmetry is what makes it worth auditing first. A site with a robots.txt error, a stray noindex or JavaScript-dependent content can publish excellent work for a year and see none of it rank, with no error message anywhere to explain why. The reverse is also true: flawless technical health does not compensate for content nobody wants. The productive sequence is to remove technical ceilings first, then invest in content and links knowing they will actually be counted.
How to check it on your site
Start with indexation
Search Console's Pages report shows exactly which URLs are excluded and why. Nothing else matters until this is clean.
Crawl the site yourself
Screaming Frog or Sitebulb surfaces redirect chains, broken links, duplicate titles and depth problems in one pass.
Check Core Web Vitals field data
Real-user metrics identify which templates are failing rather than which pages you happened to test.
Verify rendering
Compare raw HTML against the rendered page to catch content that only exists after JavaScript runs.