i just think free online resources for anything are neat.. learning new stuff is cool + you need to focus alot so if u have to take something off your mind, that's the perfect way!
- khan academy - a super cool non profit site with courses from all kinds of subjects! it helps me alot at school, as well as with learning completely different things, like art history or coding! it's available in many languages. there's also a mobile app but there's more stuff on the website.
- drawabox - a completely free drawing course. i recommend it as a starter if you wanna learn how to draw or improve your skills. its community is very active and sweet too
- proko - some free videos regarding anatomy and figure drawing
- ctrl+paint - again, some free videos teaching digital painting
- code academy - bunch of coding courses, some free, an app is available
- free code camp
available on mobile and in browser
- pixblocks - an app for learning python, a bit similar to scratch. there's
a mobile and desktop app (desktop one has more content) and it's available
in english, polish and russian. if you speak polish, there's also
a bunch of useful stuff on their youtube channel