Coming from Photoshop (and no longer doing any serious graphic work), I've found https://www.photopea.com/ (an in-browser photoshop clone) to be really great for 99.9% of my needs.
It's free, has the same UI as photoshop so no re-learning hotkeys, and is browser-based.
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Krita is the best alternative to Photoshop and it runs on every platform (including Linux).
Even trying GIMP over multiple years I could never make sense of it's UI but Krita is a breeze and incredibly powerful.
Coming from Photoshop (and no longer doing any serious graphic work), I've found https://www.photopea.com/ (an in-browser photoshop clone) to be really great for 99.9% of my needs.
It's free, has the same UI as photoshop so no re-learning hotkeys, and is browser-based.
Krita is literally a KDE app