Any advice on how to get started?

[Kayato]

Hello everyone!
After years of admiring the beautiful works collected here, I thought I'd start and try to contribute.
I tried to look at the pinned topic about it but I saw that it is very old with some dead links.

So I'm asking for some advice and programs to get started with. I was thinking of starting with something simple like map editors from games like "Warcraft" or "C&C" just to practice.
How can I do this? Do I take screenshots, perhaps using macros to automatically move the images to the right distance, and then recompose them using a graphics program? I already use OBS Studio and GIMP.

Thanks in advance everyone!