Second Brain & Personal KM
A second brain is a personal system for capturing, organising, and resurfacing what you learn - so you stop re-deriving the same ideas and re-googling the same answers. In 2026, this stopped being a note-taking hobby and became something closer to infrastructure: your notes are no longer just for you to read, they're a corpus an AI agent reads, maintains, and reasons over alongside you.
In This Section
Second Brain & PKM Concepts
Capture, organise, retrieve - the Zettelkasten method, atomic notes, and why a second brain is a system, not an app.
Obsidian for AI-Assisted Notes
Why local Markdown files became the preferred substrate for AI agents - the official CLI, RAG-over-vault plugins, and staying model-agnostic.
Karpathy's LLM Wiki Pattern
An agent that builds and maintains a structured markdown wiki of what it learns, instead of you retrieving from a pile of raw documents.
Claude Code as a Self-Maintaining KB
Turning CLAUDE.md, a living plan file, and a session log into a second brain for your coding agent itself - across sessions and projects.