Netgear smart wi fi router network connectivity problem

Why are the devices connected to my Netgear router not browsing? I recently purchase and set up a new Netgear AC 1200 smart wi fi router (Model R6220) in my apartment, but the devices connected through the router are not browsing the internet. I have called my ISP about the problem, but they said they haven’t received any complaint from any customer meaning the router is likely the cause. How do I fix this?
