Blender or 3D in general has a respectable learning curve we all must climb. To help establish a starting point of your journey with CG Cookie, or a way to track how far you've climbed we offer simple progress reporting.
Is an automatic thing that will happen if you let the video play all the way through. You're able to also manually mark content as watched if you prefer. Keeping in mind the ability to mark it watched is there for you. There are no prizes to mark everything watched on the CG Cookie library.