For specialized subjects there is a need for some MIT mettle, but I find many freshman courses are very clear and easy to understand, even more so than their eq

For specialized subjects there is a need for some MIT mettle, but I find many freshman courses are very clear and easy to understand, even more so than their equivalent Khan Academy materials. Before his controversies, Lewin's Course 8 classes/recitations were a gold standard in Physics learning. He combined intuition and rigour masterfully - along with some brilliant practical experiences. The recurring theme in many courses (not only Lewin's, but Calculus, Economics, or even Strang's linear algebra) is the great care and preparation of the materials to get the point across. I think this, more often than not, is very successful.