Best productivity systems for lifelong learners: Time blocking (protect a fixed daily slot, treat as immovable). PARA method / Second Brain (tag knowledge by project relevance). Anki for spaced repetition (15 min daily review beats re-reading). MIT Method (one most important learning task each day, first). Weekly review (20 min: what did I complete, learn, and discover as gaps?). Immediate capture (record every insight instantly). Start with time blocking and build the rest on top.