All great points. > it's okay to move ahead if I know at least 80% of the material. One of the worst feelings is moving on in a textbook and realizing you are

All great points. > it's okay to move ahead if I know at least 80% of the material. One of the worst feelings is moving on in a textbook and realizing you are indeed totally lost. Here’s my own list of necessary but not sufficient conditions for deep learning: - Motivation. Easy to overlook; hard to get if you don’t already have it. - Frequent experience of “I have no idea how to solve this,” followed by hours or days of playing with the problem, followed by a eureka moment. You can’t be sure you’ve learned the thing unless you’ve constructed the solution yourself. Builds confidence too. - Seeing the same material in different contexts or presented in different ways. It’s like looking at an object from different angles. And for bonus points: - Teach the concept to a curious friend. Their questions will lead you to deeper understanding.