This is a small reflection of my "How-To" draw library. I believe almost every artist has one. Before I went to school for animation, I was self taught, despite a year of illustration study right after high school. I learned a bunch but not what I thought I wanted to learn. It took a few more years before I got up the nerve to try animation.
Along the way these books were invaluable in helping me get into Sheridan's prestigious animation program (on the first try, even). If you're looking to learn more about drawing but school is out of reach right now, I highly recommend picking up one of the following tomes.
(Disclosure: these are Amazon Affiliate links. I will receive a small percentage of the sale at no extra cost to you.)
And for those with the means, the venerable Famous Artists' Courses: