There are telegram, slack, and discord groups that are into crypto but most of them are crowded. There are also some good youtubers as others have said already but I suggest not to subscribe to those who shills ICOs like suppoman (there are others who are way better). Forums are still one of the best for me, just look for the proper boards and you can find a lot of valuable information. You can also find good info and updates from cryptocurrency news sites, I recommend you check out The Currency Analytics.