Best ETH communities to discuss and learn

Hey everyone, I'm learning more about crypto (particular ETH and the ERC-20 ecosystem) and wanted to know what are the best sources of information and communities to check where things are being built, new concepts introduced, etc.

I've joined some Discord channels and subreddits but wanted to introduce a list so we can always follow the latest and greatest on crypto. I'd like to create this post so people could propose their favorite channels of information so I can organize it to help all newcomers to the Ethereum ecosystem!