Only I (Terrochan) can add things to the Featured folder. The best of the best go there!
Concept art qualifies pretty much any art based on your game yet isn't used in game (in game art should go in screenshots)
Community resources are things made BY YOU (not by the generator) that are free for the community to use. Please be sure to state whether or not your resources may be used commercially.
Fan art is for fan art of OTHER RM games. This is not general fan art.
And finally, no Pokemon fan games. Other fan games are fine strictly because there aren't many of them, but there is an ocean of Pokemon ones (for some reason). Also, don't post any resources you've ripped from other games, please.