You need an objective goal. In school you have a nice objective goal of acing a test or whatever. I've found learning stuff just because you want to know it is

You need an objective goal. In school you have a nice objective goal of acing a test or whatever. I've found learning stuff just because you want to know it is challenging, and you usually end up with a superficial understanding. Figure out what you want to do with it, then it becomes easier to motivate yourself and gauge your progress.