So I am looking at either opening an art shop again or selling premades after the rumble. How do you resize the art from a full size image to a banner or avi without losing quality? The text also gets fuzzy and hard to read and I have no clue how to prevent this. I currently use GIMP to create my art.

I personally use PS, but if you can create an artboard, resize, and export as web/legacy you should be able to keep more quality. You'll have to play around with type vs image optimization settings to find what works for you. And apologies I can't be more helpful, I've never used GIMP before...

There's a GIMP section here that may answer your question more specifically than I can if you want to take a look. Forum Art Resources

Ok thank you!