I'm tackling calculus, with Silvanus Thompson's Calculus Made Easy. A subject that I entirely detested, but have since found beauty in. But learning is hard.
Cal Newport has a blog post about a study hack method called Feynman's notebook. The idea is simple: translate your growing knowledge of something hard into a concrete form and you’re more likely to keep investing the mental energy needed to keep learning
A notebook with handwritten notes has sprung up. THINGS I DON'T KNOW ABOUT. Indeed.