If you’re looking for editing apps (like the very simple edits I do) I’d suggest Photoshop Fix. Overlays and re-backgrounding or insanely easy collages with helpful stickers is Bazaart (Although a subscription, but they have a free month trial). In terms of digital art of speed paint, I’ve heard a lot of suggestion of Gimp (the app’s terrible but the computer software is good, although confusing), MediBang, and ibis Paint X.
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