The search engines have some bots that are known as "spiders" that track the web pages and be able to classify them and then have the SERPs.

When the search robot (BOT) is on your page, it studies, tracks and follows the next link of your site to which it has permission, for example a page or section that has the label "NO FOLLOW" will not be analyzed by the seeker.

The authority is what says that the domain is "popular and secure" on the internet. It is measured by the number and quality of the links that point to a wbe page.

The relevance is what indicates a result as useful according to what the user has sought or is of interest.

With these two metrics, search engines organize the way in which they will put the possible results first.

The number of different domains is more important than the number of times they link us from the same domain, the importance of the location of the links or the quality of the links when they come from relevant sites related to our sector.