Music forums are a great way to solve common problems and find other musicians to jam with and exchange marketing ideas.
Don't limit yourself to one. Read through a few of them and join the ones you think will be helpful to you.
On the other hand, don't spend all day reading forums. Put things you learn into action. Don't believe everything you
read, and don't send money to anyone who doesn't have several ways to confirm their identity and a way to be reached offline.
The only exception to this might be anything sold through clickbank.com. They will give a refund for any reason.