Welcome. Now that you've joined this forum, don't be surprised if you find yourself browsing others. I can almost guarantee that you'll find one related to almost any interest you may have.
Back in 2002, when PHP forums were first becoming common, I was a founding member of one devoted exclusively to the 1984-88 Nissan 200SX. That's a pretty narrow niche, but that forum is still active today and has over 10,000 registered members.