Sometimes people ask me to recommend tutorials, so I decided to make a post for them.
These are tutorials I consider "must see" for digital artists:
1) http://androidarts.com/art_tut.htm - one of my favorite ever. General tutorial, mostly basics. Helped me a lot a few years ago.
2) Understanding Color - great color theory explanation, also helped my a lot when I struggled with colors.
3) Understanding Composition - composition from the same person as the previous link.
4) Proko's channel - anatomy. Fun and easy to understand :D
If you have other tutorials you'd like others to see, feel free to share in comments, I may add them to this p