The search engines update their search algorithms more or less regularly. In short, they optimise the ranking criteria.
A few years ago, for example, it was still very important to have one of the most important keywords in the domain. Nowadays, that hardly plays a role.
But what hasn't changed over the years is that content still counts. That has never changed. This criterion is becoming more and more important and will probably never lose its significance: Content is King. That was the case in the past and is becoming more and more important.
