Forums are still alive, active, and a treasure trove of information (via) Chris Person:
When I want information, like the real stuff, I go to forums. Over the years, forums did not really get smaller, so much as the rest of the internet just got bigger. Reddit, Discord and Facebook groups have filled a lot of that space, but there is just certain information that requires the dedication of adults who have specifically signed up to be in one kind of community.
This is a very comprehensive directory of active forums.