Blog Post categories to specific page

[Allyhubgroup]

I want each page on my website/blog, to have categories attached to them and when I post something, I assign it to a category, and that is the page it will be published to. On pages, a category is in one place.
I don't see that happening and I would like to know how to do that.

And, is that the way it should be done? Am I thinking about this incorrectly?

If you have a thought about this, id appreciate it.

Iris