Heard a little rumor about Adobe. Now's as good a time as any to share with everyone the apps I draw/paint in. 😉
Infinite Painter (Android) - This is my default. I did exclusively traditional mediums for a long, long time, and this app feels the most like using the "real thing". It has vectors, filters, and a robust editing menu. It autosaves. New files open with a menu of commonly used dimensions/dpis so you don't have to memorize them. It has an extensive online manual that teaches you how to use everything. It can export to just about anything - it'll even save all your layers as transparent PNGs if you don't see the filetype you need. (Cons: the larger your canvas, the more likely it is to glitch, and the fewer layers it can comfortably support.) It's cheap, and a one-time purchase.
Medibang Paint Pro (Android/Mac/PC) - This is where I make comics. It has built in tools for manga: frames, fonts, screentones. It autosaves temporary backups. It has online storage so you can bounce back and forth between editing on your tablet or your computer, and group access for multi-person projects. It has a basic online tutorial, regular user-written tutorial articles, an active online community, and sponsored contests with cash prizes. (Cons: It doesn't have a basic rotate tool, or many editing/filter options.) It's cheap, and while I did a one-time purchase, I think they've either switched to or offer an optional subscription model.
That's... about it, really. For me everything else is pencil and paper. Or epoxy putty and model paint... Once or twice a year I break out the watercolors. I dabbled in Clip Studio Paint, but the menus are way too tiny on my small tablet. I recently downloaded IbisPaint (Android/Apple), but I haven't tried it out yet.
