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Second Brain

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headline: Second Brain
description: External system for capturing and organizing personal knowledge outside your head.

A second brain is a personal knowledge management (PKM) practice: an external, trusted place to store ideas, notes, and references so you can think clearly and act without holding everything in working memory.

Modern implementations often use tools like Obsidian or semantic wikis that combine markdown files with structured metadata. An LLM Wiki extends the idea by having an agent compile and maintain interlinked articles—turning a passive archive into a Personal Knowledge base that agents can navigate.

See also Declarative Knowledge and Procedural Knowledge for how facts and workflows are represented in this wiki.

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# Second Brain

A **second brain** is a [personal knowledge](Personal_Knowledge.md) management (PKM) practice: an external, trusted place to store ideas, notes, and references so you can think clearly and act without holding everything in working memory.

Modern implementations often use tools like [Obsidian](Obsidian_Integration.md) or semantic wikis that combine markdown files with structured metadata. An [LLM Wiki](LLM_Wiki.md) extends the idea by having an agent compile and maintain interlinked articles—turning a passive archive into a [Personal Knowledge](Personal_Knowledge.md) base that agents can navigate.

See also [Declarative Knowledge](Declarative_Knowledge.md) and [Procedural Knowledge](Procedural_Knowledge.md) for how facts and workflows are represented in this wiki.

Metadata: Second Brain

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