Hey there! I'd say that the best thing you can study is perspective and form manipulation. At least for me, these are the two most important fundamentals, and it is part of Artwod's six principles. - Structuralization - Manipulation - Observation - Education - Imitation - Imagination For example, if you want to learn figure drawing, learning anatomy is the slowest way to improve since drawing a human is 70% form/perspective, 20% gesture and the rest, anatomy Learning form by breaking things down into basic shapes is the best. So... ArtWod is your best friend for this! The Intro to Drawing and Intermediate Drawing will help you a lot with this. There are other options as well, like Dynamic Drawing by Peter Han (which is basically what you can learn in AW). Hope this helps! :)
