There is no fixed number, but technical SEO is usually grouped into four areas: crawlability and indexing (robots.txt, sitemaps, canonical tags, redirects), performance (page speed and Core Web Vitals), site architecture (URL structure, internal linking, mobile rendering), and markup quality (clean HTML, structured data, HTTPS). Some guides list more types, but they all fall under these four.
There is no official count of technical SEO types. Different guides list anywhere from three to a dozen. In practice almost everything falls into four areas.
1. Crawlability and indexing
Can search engines reach and store your pages? This covers robots.txt, XML sitemaps, noindex tags, canonical tags, redirects, and the crawl errors Google Search Console reports.
2. Performance
How fast does the page load and respond? This covers Core Web Vitals, image optimization, the amount of JavaScript and CSS, caching, hosting and CDNs.
3. Site architecture
Is the site organized so both people and crawlers can find everything? This covers URL structure, internal linking, navigation depth, mobile rendering and how pagination and filters are handled.
4. Markup and security
Does the code tell search engines what the page is? This covers clean semantic HTML, structured data (schema), hreflang for multilingual sites and HTTPS across every URL.
Why the grouping is useful
The four areas also give you a working order. Fix indexing first, because nothing else matters if the page cannot be crawled. Then performance, then architecture, then markup. Treating them as a checklist in that order is more useful than memorizing how many types a particular guide prefers.
