[narribbi]

> The problem with self-teaching is that you don't know what you don't know, so you don't realise where the gaps in your knowledge are.

That is why the only valid starting point is : the problem at hand and to solve.

From there, you can work your way back to what lack of knowledge prevents you from solving the problem.

If knowledge does not show up somewhere, assisting you while solving a problem, it is most likely useless knowledge and undoubtedly just a waste of time.