What is the logic of similar posts on the site, is it possible to change them?

Question

PHP

Hello.
I am writing a simple website from scratch blog.
Tell me what should be the logic of similar records?
In theory, similar records should be selected once and for all, because otherwise, when new records are added, similar records may change, and this is probably wrong and will have a bad effect on search engine optimization.
Is it acceptable to change constantly similar posts, for example, choose random ones from the same category?

Answer 1

use tags.

Answer 2

Similar entries should be relevant, that is, instead of similar ones, you want to issue random ones, that is, score on the user and from the user’s point of view, you can not show them at all, since they only interfere, well, or you have millions of new pages a day and you want to improve indexing, well, or not, and the dunce and you have nothing to do and you decide to come up with some kind of nonsense

Answer 3

Related posts are constantly changing. It's not a problem. Choose from several criteria

1. header
   
2. Taxonomy terms
   
3. Content
   

Answer 4

The simplest thing is to display from the same section (if the entries are scattered by category).
It is more correct, as already mentioned above, to search by tags.