Talk about hacks you've been playing, inquire about hacks for games you might be interested in, discuss making hacks, advertise hacks you've made though I doubt anyone here has done that, and point and laugh at gay drama in the rom hacking community.
You can find most rom hacks here.
https://www.romhacking.net/
http://www.baddesthacks.net/
romhacking.net is run by oversensitive trannies but it's also the largest database for hacks and hacking tools on the internet. baddesthacks.net hosts many hacks that were rejected by romhacking.net. Most of them are just shitposts, like a hack that translates all the text in Secret of Mana to braille, but there's a few interesting ones here and there. If you want more than that, you'll have to go to websites that are dedicated to hacking games from a specific series like feuniverse.us.
I finally decided to get into Fire Emblem rom hacks so I decided to start with a hack of Sacred Stones called Fire Emblem Vision Quest because everyone says it's the best one. It is pretty good so far but there are a few problems with it. The creator really liked making chapters where you have to protect a bunch of NPCs which are always a pain. There are levels where you have to protect everything from chickens, to gazell