Internet car forums are the only reason my cars are still running. A trove of endless car information to fix things yourself and not let them become obsolete, where to find parts, what new parts fit old chassis, etc. Will forever be grateful for them
I've been very heavily involved with https://forums.ageofempires.com/ since Reddit kicked the bucket. I don't love the fact that it's controlled by a company with a very obvious bias, but apart from an overzealous language filter they seem to be pretty good at allowing very strong criticism...better than I've seen some companies that run their own subreddits be, anyway.