There's no point in your education where someone teaches you how to use your brain. Your brain is the most complex object in the known universe. Most people don't realize that. Weigh more so than your heart or your lungs and it has certain requirements for how it works. The right level of sleep and nutrition to power your brain keep it functionaly obstinately. How can we store memories, review memories, maintain memories? So that's the cont of stuff that we teach in our books.