SIGNAL GRID ACADEMY
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Second brain · Beginner

Build a Second Brain for Claude

A folder of notes Claude can read, search and update, so it knows your world.

4 lessons 54 min Certificate
Steps for
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Lesson 1 · 10 min · Windows

What a second brain is (and why most die)

A second brain is a trusted place outside your head for ideas, decisions, projects and references. The idea comes from Tiago Forte's Building a Second Brain.

Most second brains die because notes pile up and nobody re-reads them. The fix: let Claude read them for you. Your notes are plain markdown files. Claude Code can open, search and write those files, so your vault becomes context Claude uses every day.

The pair

  • Obsidian makes notes readable for you (links, search, graph view).
  • Claude Code makes them useful to a machine (summaries, answers, updates).

PARA in one minute

  • 01 Projects: things with a finish line (launch a website).
  • 02 Areas: ongoing responsibilities (health, finances, clients).
  • 03 Resources: topics you collect (AI tools, recipes).
  • 04 Archive: finished or paused things.

Plus 00 Inbox for quick captures and memory/ for facts Claude should always know.

Install Obsidian

Windows steps
powershell
winget install Obsidian.Obsidian

Or download from obsidian.md.

Quick quiz

Pass 2 of 3
1. Why do most second brains die?
2. In PARA, where does 'Launch my bakery website' go?
3. What file format makes the vault readable by Claude Code?
Join free to take the quiz

Quick assignment

To do

List 3 projects, 3 areas and 3 resources from your own life that will go into your vault.

Hint: Projects finish; areas never finish; resources are topics.

Join free to submit

Stuck or proud of what you built? Discuss this course in the forum.