Category Post showing on Home Page

I have 3 different categories set up, whenever a new post is made in Any category, it automatically shows up on the “Home Page” of my site.

How do I prevent those Category posts from showing on the “Home” page?

I would like all posts in Category 1 to only show when someone clicks on the link for Category 1.

All the links for Category 2 to only show when someone clicks on the link for Category 2, etc.

The default category is cat # 3.