Bitcointalk is a community forum that focuses on Bitcoin/crypto. You simply use Bitcointalk if you're interested in talking about Bitcoin/crypto — that's pretty much it. The same reason how you might join a photography social media group if you're really interested in photography.
Well explained Great I'm very much interested in Bitcoin Crypto and start my learning in bitcointalk I thing its a great platform for solving problems and investing in Bitcoin. I hope I will learn it very easily and also start my earning by trading in bitcoin. Thanks