Proko
www.proko.com/course/drawing-basics/overview
For those at the start of their journey, Proko’s online Drawing Basics course by Stan Prokopenko offers a good grounding in the fundamental principles you’ll need to learn drawing. The course begins with lessons on line quality and looks at breaking objects down into simple shapes, before moving on to perspective, colour values, and study of how the edges in your drawings can make them more dynamic and exciting.