Howdy! Welcome to MFGG - I hope you enjoy your stay here!
I'm glad that the forums have been blessed with another Vinny.
You earn coins for participating on the forums - for example, creating new topics, replying to other people's topics, or referring new members.
Don't worry - coins do not involve real money! Also, they have nothing to do with cryptocurrency or NFTs, fortunately.
Sadly, coins don't do very much. At one point we were planning to implement some ways you can spend coins - maybe a custom profile - but implementing it proved to be rather complex. Still, you can donate coins to another member as a reward for a special event or a post you found especially helpful.