yeah, I have to say as a newer user that does get confusing.
There's a brief explanation in the rules thread, located in PGC. And if you're still unsure, feel free to ask me.
Lots of people seem to... not get that. Like this one guy in Pokemon General asking for a list of completed ROM hacks. :|
I think after you grasp the concept of both those forums though, it's easy to understand. I know it's odd when you're new, but if you read the rules threads in both sections and just kinda look around at what threads are in which section, it'll piece together. Of course, not everyone wants to do that...