So I do most of my digital work in Paint Tool SAI, but I'm looking into expanding my artistic horizons and trying out new styles. Currently I'm super familiar with the lineart and pen tools, but I want to expand into digital painting. Problem is, I know nothing about the various brushes, how they work, and how I'm supposed to use them. The usual tutorials I find tend to assume a bit more familiarity with the subject than I have. So, the question is, how the hell do you paint and use brushes in SAI?