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Building a Second Brain (BASB) is a systematic approach to capturing, organizing, and retrieving personal knowledge. You externalize ideas, notes, articles, and insights into a digital system (Obsidian, Notion, Roam) with interconnected notes, tags, and search, creating a external memory you can query for insights and decision-making. Knowledge workers swim in information overload. A Second Brain system reduces decision fatigue, enables pattern recognition across notes, and compounds learning over time. It's career insurance; your brain is a poor long-term storage device, but a good knowledge system is forever.