In simple words - it is a set of actions performed on our website by which soulless Google robots evaluate its quality.
To enumerate the metrics on which the calculation is carried out - wipe your fingers to the elbow on the keyboard, and not all of them are open to public inspection. You don't have to.
There are also social networks and the concept of dynamic content.... But in this article I have already done my SEO.
By the way, can you make a good website in 4 days, do you think? - Email.