I suspect what you want is to use the pre_get_posts hook. You can read about it here. This will allow you to define which categories to include or exclude from your homepage.
it probably can work.
Is this a specific plugin i can add from “Add Plugins” section or is it part of code that i must write? because i have not so much experience from coding (to almost none)
if it is plugin what is its EXACT name to search it?
I have tried pre_get_posts hook, Plugin_API, Action Reference but can’t find anything if there is anything to find.
Is any plugin for that?