Videos give an overview of the course/lesson plan before a single line of code is written. This gives context and a general understanding of what is possible and how teaching will be approached.

After each video, there are a series of challenges that give you a chance to apply what you just learned. The great thing about these challenges are that they force you to think through a problem, and use the new skills to solve it. It's not just regurgitating facts; it requires some effort.