Templates for posts from a specific Cat.

Hello. I was wondering how to make templates for POSTS (not pages) from a specific category. Say, “New Post” was filed under “Uncategorized” and when I go to the single post page/permalink of “New Post” (usually https://domain.com/wordpress/new-post) I want it to display a template exclusive for the posts of the category “Uncategorized”

or to make it more simple, how do i make an exclusive template for posts of a specific category?
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I’ve looked at the codex and I believe that what i am looking for is not found on codex.www.ads-software.com/Category_Templates becuse that teaches me how to make a template for a category archive, not a template for the posts of one category.

I’m sorry if my post seems very weird and not very easy to understand. but please if yo don’t understand please feel free to post back so i can explain more

thanks ??