Hum, I'd kind of disagree with that advice actually. I find for me the Feynman technique works best for learning. Basically it says, assume you know everything

Hum, I'd kind of disagree with that advice actually. I find for me the Feynman technique works best for learning. Basically it says, assume you know everything needed to do the work or teach someone else about it, then go do the work or try to teach someone (by writing a blog post for example), and continue until you face a blocker where you actually don't know how to progress or don't know enough to teach that part, then go read just enough to get unblocked, rinse and repeat until you know it all. What I like about this is that it maximises the search space to spend your learning effort on what really matters. Otherwise it's easy to say... spend too much time on early chapters and not enough on later ones for example.