Comment by Red_Tarsius

I don't expect you to solve it, but since you're looking for problems... I'm kind of a perfectionist (not in a good way) and whenever I want to learn something new, I spend days and days beforehand just searching for the p.e.r.f.e.c.t. books, video lectures and what not. For example, I'd like to get back into physics, especially quantum mechanics. A website that, given any scientific field, gives me a list of the most important books and papers per difficulty level would save me a lot of time. However, this service should only list the best of the best. I don't know if this is a common problem or how you could monetize such service...