How to disable page indexing of files in wordpress?

Question

Search Engine Optimization

How to close from indexing the pages that WP itself creates for the pages?
I tried a plugin that should solve this problem, but it does not help.
I will make a reservation right away, closing in robots.txt does not help. There are many links, the webmaster swears at the lack of a description.
I heard about some redirects, but I don’t understand what they are and how to set them up