You create an account and can join/leave whatever channel (forum) you want without setting different accounts handing out your email etc.
When you're on a channel, they have different sections for users to talk in just like a forum too. So, skybluetalk for example could have:
Match day live
Post match reaction
General
Off topic
Tech
Etc
Yeah, but discord tends to be easier to use for users and admin. Plus, erm, it's not using this old forum system and it's free. so no hosting fees etc if that helps.