Technical SEO.

Technical SEO is the foundation on which content can rank at all. The best text is useless if Google cannot find the page, cannot render it or classifies it as a duplicate of another page. Technical SEO therefore deals with how a crawler such as Googlebot experiences a website: which pages are reachable, which status codes they return, how quickly they load, and which version of a page is the authoritative one?

Typical building blocks are the robots.txt, which controls which areas may be crawled, the XML sitemap as a directory of the important URLs, the canonical tag against duplicates, 301 redirects for changed addresses, HTTPS, hreflang for multilingual sites and loading time, measured by the Core Web Vitals. Then there is the question of whether content is in the HTML or only loaded later via JavaScript, which can make crawling harder.

With the rise of AI search systems, technical SEO has gained an additional layer. Many AI crawlers do not execute JavaScript and only see what is in the delivered HTML. A website that renders its content on the server (server-side rendering) is readable for these systems; a pure client-side app often is not. Today it also includes the deliberate decision about which AI crawlers are allowed in the robots.txt.

For most SME websites, technical SEO is not an ongoing project, but it is mandatory with every relaunch, every new page structure and every change of CMS. Many ranking drops that occur after a relaunch have technical causes: missing redirects, noindex directives set by mistake or a staging environment that was publicly indexed.