how to build a second brainThe Second Brain
Build a Second Brain: Capture Knowledge With AI
A "second brain" is an external system where you capture notes, ideas, links, and references so you don't have to hold them in your head — and AI now makes it far more useful by searching and summarising your captured knowledge in plain language. To build one: capture in one place, organise lightly, and let AI help you resurface what you saved when you need it.