I've had a different idea for a while. What I've always wanted to do, and would do if I had unlimited time, is create a kind of tech-tree of various computer science concepts, organized into subjects/tracks/courses, with each vertex in the tree being a clear and concise 4-7 minute youtube video (with accompanying downloadable code if applicable). Note this wouldn't necessarily need to be a real tree as things such as e.g. machine learning would need backgrounds in both linear algebra and statistics.
Then you could learn from scratch by simply traversing down the tree. If you wanted to learn something, you could search it and determine where in the tree to start watching about it by where you feel like your knowledge ends. So if you're looking up np-completeness, but feel you don't understand the concepts of p and np, you can watch those videos first.
It would take a long time, though.