I would go seriously mainstream (as in mainstream scientists) for such advice. Accomplished mainstream scientists. The advice will be boring: enroll in a course, maybe online course, do not skip homework, do not skip problems, do not skip test. The kind of stuff you probably already know.

If you are looking at some much easier way to become awesome competent, I am afraid you're asking for bad advice.

The Luke sure thinks that what he did was scholarship and that it benefitted him, but you should look for people who did objectively benefit from their studies, in a way not involving some sort of selling of ideas to the uninformed public. You need to somehow exclude as source of the advice the people who just babble of some advanced subjects they have incredibly poor understanding of, unaware of own incompetence.