Mikoma 2021-01-03 02:01:28

You should check out this page out in the NG Wiki:
https://www.newgrounds.com/wiki/creator-resources

The Creator Resources page has a lot of good suggestions on where to start if you want to start creating things.

For 2d animation, I'd recommend Opentoonz since it's free. Krita is also a good option since they added features that allows animation so it doubles as an art and animation program, so I think it'd be nice to check it out.

For 3d animation, I hear a lot of people are using blender since it's good and free. I think Blender can also be used for 2d animation but I'm not sure, didn't really check it out myself.