CentOS

this is a a clean install . the only error I see it . When I try to install software like the gnome shell ext like sudo dnf install chrome-gnome-shell I get not found . All so I get not found on most software .

I want to move to centos 8 as my daily driver . But When I try to install . It can not find it . I would like to know how do I enable software repos . the only repos I can get to work is rpmfusion ?