I used to use Gimp at school, seeing it was always installed on the school laptops and it was good for doing pretty general things such as free transforming, basic picture alterations, and a lot of other things. I personally went online and looked for “how to’s” if I got stuck but really need to do something and GIMP was the only thing available. I survived for a year on the team designing things on GIMP after getting used to the program.
Photoshop is so so so great though. You can do so much on it and is much more flexible with scans and major alterations, and of course graphic design. Overall it blows GIMP out of the water, but you’re paying for the quality. It’s not cheap but definitely worth it. After a year of GIMP we actually invested in putting photoshop on one mac for me to use and it did me good, and made my life so much better when it came to making logos, working on banners, etc etc. Photoshop is worth its price if you are going to use it and you figure out how to use the functions.