I use Photopea for Photoshop stuff, GIMP if what I'm doing needs a particular feature or does better (though that's not Very many anymore). Inkscape is surprisingly good once you get accustomed to the interface.

I've heard good things about Krita but I've not messed around with it at all, but it supposedly is much more modern and user friendly than GIMP but suited for digital art and drawing.

I'm hoping affinity comes to Linux, or at least proton/wine pushes hard for it because it's the one area where desktop Linux is really poor at the moment