What is the best way to restrict bad websites? Router? Software programs? I know I can't keep them completely protected but I want to at least do as much as possible. I've already had discussions with him about what he should not be typing in. I will be having more.

I have the restrictions on the iPad and my phone set for the adult content but it doesn't catch everything. What more can be done beyond that? And no he does not have his own device. A neighbor boy was the instigator it appears.