Besides most courses being beginner-focussed, there are at least two other related problems: - Most advanced courses sell themselves dishonestly as beginner-fr

Besides most courses being beginner-focussed, there are at least two other related problems: - Most advanced courses sell themselves dishonestly as beginner-friendly even if they aren't after the first couple of lessons. On the free market everyone is after every single potential customer, no matter what. - Everything is stretched out so much that information density is annoyingly low. Again free market pays per page and minute and not value. You might have more luck looking at resources produced free from these constraints and the best place I know is university courses. Still, good ones are hard to come by, but I learned a ton at uni I'd never had learned outside.