join a free group is not a bad idea if you want to learn something about crypto,but if you are talking about paid groups.
i am totally against it,because most of them are scammer and they are only looking for their own benefit.
just learn something from people and do not put your back completely onto them,watch them and learn from them.
also it is recommended for you to create your own strategy by looking at our current market and experts strategy.
try to learn something technical here ;
https://www.tradingview.com/ (it's totally free,and you can chat with other people regarding our current market and their analysis about it)