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Every practice in the library, in one list. Narrow it by how long you have, who it is written for, and where you are right now.
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By your teens you need some way, any way, of answering one question: given that it is this time on this day, what should I be doing? A plain system that answers it beats a beautiful one that does not.
Paper, phone, whiteboard on the fridge, the format is not the point. If the answer depends on remembering, it depends on luck. Pick the thing you…
Looking for a whole subject rather than a single practice? Start from the nine areas.