Having posts on seperate pages?

I’m trying to write posts and posting them but I want them to be in different pages. Like for example, I have the post “welcome” on my site on the home page. If i wanted it to be only seen on the page “blog” then what do i have to do? I want to be able to separate everything by page and the use categories but i dont know how to do that. Is there any way possible for me to do it?? Also, when i click on the “welcome” link it takes me to the blog page but i just want it to take me to the home page. How can i make it just send me to the home page again and how can i make other links go to their respective pages???

this is my site if you want to see what i mean
https://www.bodyweightphysique.com