Are there any useful BTC Discord channels? Can you name some of them?

I am looking for great crypto/defi servers to join. It is also important for me to join not a specific project but a more versatile, multi-skilled, and experienced community. The channel should have a variety of topics for discussion, a positive attitude, useful educational tips, etc.

Please, share your opinion and highlight your top list of the best public and private Discord servers. I would also appreciate it if you could define some of the strengths of these servers, which are what make them so great. A thousand thanks in advance, mates!