How to close all pages except certain ones?

Question

htaccess

Good afternoon!
There is a site on wordpress, consists of 4 pages, 1 of them is a portfolio where entries are displayed. I need to close and redirect to the main page of all pages, including the page of each post, and leave only 4 pages. Do not tell me how to implement?
Initially, I thought to redirect via htaccess, but it seems to me not very convenient to do this for each entry, perhaps there is a simpler solution.
I apologize in advance if I misunderstood the point somewhere.
Thank you.