“Every time you take a note, ask yourself, “How can I make this as useful as possible for my future self?” That question will lead you to annotate the words and phrases that explain why you saved a note, what you were thinking, and what exactly caught your attention. Your notes will be useless if you can’t decipher them in the future, or if they’re so long that you don’t even try. Think of yourself not just as a taker of notes, but as a giver of notes—you are giving your future self the gift of knowledge that is easy to find and understand.”