As distinct from on-page SEO, off-page SEO and automated SEO, technical SEO refers to activities that directly impact the indexing and crawling of your site by search engines. The easier your site is to navigate by search engine algorithms, the higher your search ranking is likely to be.
As such, it is essential that the separate components of your webpage are configured so that a search engine can crawl, render, and index your website. Site speed is one of the key elements of technical SEO, as well as structuring of data and other factors that we will come to.
The bottom line is that paid searches are not enough to generate user confidence anymore, at least beyond the short-term.