How to add pkgs.org and other mirrors in centOS 8?

https://centos.pkgs.org/8-stream/centos-appstream-x86_64/ 
http://mirror.centos.org/centos/8-stream/AppStream/x86_64/os/Packages/ 

I am new to centOS. I want to add these two repositories so that whenver I use yum install I get the latest packages from them. For example I want to install clang 17. Currently when I input yum install clang It shows clang 12 which is pretty outdated. I want the result like When I input sudo yum install clang it shows the clang version 17