>instead of repeating a slightly different version of what you've already learned
while I generally agree with your idea, a little counterpoint: it depends on a way you consume those materials. If you do that thoroughly, actually read and analyze source codes or examples, try things on your own as instructed, complete excercises and so on there is absolutely no point in doing multiple thins on the same topic. But if your preferred method is fast skimming, skipping some excercises and so on then skimming two or three books/videos/whatever on the same subject could make some sense. The latter method is very chaotic and is probably not the best idea to apply it for learning the fundamentals, but I just wanted to point out that such a learning technique does exist and sometimes makes sense, especially if just the general understanding is your goal.
while I generally agree with your idea, a little counterpoint: it depends on a way you consume those materials. If you do that thoroughly, actually read and analyze source codes or examples, try things on your own as instructed, complete excercises and so on there is absolutely no point in doing multiple thins on the same topic. But if your preferred method is fast skimming, skipping some excercises and so on then skimming two or three books/videos/whatever on the same subject could make some sense. The latter method is very chaotic and is probably not the best idea to apply it for learning the fundamentals, but I just wanted to point out that such a learning technique does exist and sometimes makes sense, especially if just the general understanding is your goal.