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What is a Commonbook?

A commonbook, sometimes known as a commonplace book, is a personal collection of knowledge, ideas, quotes, and reflections. Some people call commonbooks “second brains,” but I don’t like that term. One brain is enough for me!

Keeping a commonbook helps you:

  • Organize your thoughts and ideas in one place.
  • Reflect on what you’ve learned from reading and experiences.
  • Make connections between different pieces of information.
  • Preserve knowledge for future reference.

They can be both! In fact, I maintain a physical commonbook alongside this digital version. I write down notes, quotes, and reflections by hand on 3x5 index cards, which I then organize in a box. Each week on Sunday, I transfer the physical notes into an Obsidian vault, which powers this website.

Is this the same thing as “Zettelkasten”?

Section titled “Is this the same thing as “Zettelkasten”?”

Zettelkasten is a specific method of note-taking and knowledge management developed by the German sociologist Niklas Luhmann. Typically, Zettelkasten involves creating small, atomic notes, each containing a single idea or piece of information, and linking them together to form a web of knowledge. This is close to what I do, but I don’t strictly follow the Zettelkasten method. I tend to play it more by ear.