Even if it's a small tutorial, it's enough. After that, you have to practice and practice again. If you knew someone who could correct your tests afterwards, this is the best!
As mentioned by rmorel, you need to know what point you want to go deeper if you want more information about this site.
Drawing is learned on paper, on the computer we learn to manipulate the drawing software, because it facilitates the work of drawing and does not draw for a person.