You can follow along with just a pencil, paper, and eraser, but drawing tools such as vine and compressed charcoal, conté, kneaded eraser, chamois, blending stump, and ruler can be helpful. (Materials are explained near the beginning of course)
Anyone wanting to learn to draw. Recommended for adults and determined teens.
Painters! The best way to improve your painting is by learning to draw.
Anyone interested in seriously pursuing art. Although this course in particular is designed for absolute beginners, THE ART & SCIENCE OF DRAWING series is designed to teach the fundamentals of master drawing.