Zettelkasten Method: A Plain Guide to Starting One
The Zettelkasten method is a way of taking notes where each note holds one idea, written in your own words, and links to the other notes it relates to. Over time the links matter more than any single note: you stop filing information and start building a web of ideas you can follow and write from. You can start one today with any notes app that supports links.
The name is German for “slip box”. The method is old, the tools are new, and the core of it fits on an index card.
What is a Zettelkasten?
A Zettelkasten is a collection of short, linked notes. The best-known one belonged to Niklas Luhmann, a German sociologist who kept a box of handwritten index cards for decades, roughly 90,000 of them by most accounts. Each card had an identifier, one idea, and references to other cards. Luhmann credited the box with much of his writing output.
What made it work wasn’t the box. It was three habits:
- One idea per note. A note you can understand on its own, without the source open next to it.
- Your own words. Copying a quote isn’t thinking. Rewriting it is.
- Links, not folders. A new note is placed by connecting it to the notes it belongs with, not by choosing a drawer.
The modern version of the method comes mostly from Sönke Ahrens’s book How to Take Smart Notes, which turned Luhmann’s practice into a workflow anyone can copy.
What are the three types of Zettelkasten notes?
Ahrens describes three kinds of notes. You don’t need software that knows about them; you only need to know which one you’re writing.
| Note type | What it is | How long it lives | Example |
|---|---|---|---|
| Fleeting note | A quick capture: a thought, a line, a question | A day or two, then processed or deleted | “Hooks that start with a number get saved more?” |
| Literature note | What a source says, in your own words, with the reference | Kept, but secondary | “Ahrens: writing is the thinking, not the output of it” |
| Permanent note | One finished idea of your own, linked to other notes | For good; this is the Zettelkasten | “Notes should be written for a future reader who has no context” |
If you give up on the method, it’s usually here: a pile of fleeting notes that never get processed. The box only grows when fleeting notes turn into permanent ones.
How do links work in the Zettelkasten method?
Luhmann linked cards by writing the identifier of a related card on the one he was writing. In a notes app you do the same thing with a link to the note’s title, often written as [[Note title]]. Backlinks in notes explains how the reverse links appear on their own.
Three kinds of links do most of the work:
- Related ideas. “This builds on [[Specific beats vague in hooks]].”
- Contradictions. “This disagrees with [[Long captions perform better]].” These tend to be the most valuable links in the box.
- Entry points. A short index note per topic that lists the notes to start from. Some people call these structure notes or maps of content.
When you have enough links, the notes start to cluster. A graph view makes that visible, and it’s often where new writing ideas come from. Knowledge graph notes covers how to keep that graph useful instead of decorative.
How do you start a Zettelkasten in five steps?
You can set one up in an afternoon. The habit takes longer.
- Pick a tool with links and plain text. Any app that supports
[[links]]and exports Markdown will do. If Markdown is new to you, Markdown for beginners covers what you need in ten minutes. - Capture fleeting notes anywhere. Phone, paper, a chat with your AI. Don’t organize them yet.
- Process once a day. For each fleeting note: delete it, or rewrite it as a permanent note of one idea, in your own words, with a title that states the idea (“Writing is thinking”, not “Ahrens notes”).
- Link before you save. Ask: which existing note does this build on, contradict, or belong next to? Add at least one link. A note with no links is an orphan you’ll never find again.
- Write from the box. When you need a post or an essay, start from a cluster of linked notes instead of a blank page.
At the end of the first month you won’t have a second brain. You’ll have a few dozen notes that link to each other, and you’ll notice the second note on a topic is easier to write than the first.
What mistakes break the Zettelkasten method?
- Collecting instead of writing. Highlighting a hundred passages feels productive. None of them are permanent notes until you rewrite them.
- Big notes. A note that covers a whole book can’t be linked precisely. Split it.
- Folder thinking. Spending ten minutes choosing the right folder is the habit the method is meant to replace. Tags and links do the job.
- Perfect tooling first. People spend weeks on plugins and templates. Luhmann used paper.
How does AI change the Zettelkasten method?
AI is good at the parts people skip and bad at the part that matters.
It helps with processing: you can paste a fleeting note into Claude or ChatGPT and ask for three candidate titles that state the idea, or ask which existing notes it might link to. It can search a big collection faster than you can scroll.
It can’t do the thinking for you. A permanent note the AI wrote from a source is a literature note with extra steps. The point of rewriting is that you understand the idea; outsourcing that leaves you with a box full of someone else’s sentences.
The practical setup is to keep the notes somewhere your AI can read and write, and keep the judgment yourself. Personal knowledge management with AI walks through one working version. If you make content, Zettelkasten for creators shows how the same method turns small notes into posts.
FAQ
Is the Zettelkasten method worth it?
It’s worth it if you write, teach or make content regularly, because the payoff is easier writing from notes you already have. If you only need to store reference material, a simpler system will do.
What app is best for a Zettelkasten?
Any app with links between notes and plain-text export. Obsidian, Logseq and similar tools are common choices. If you want Claude and ChatGPT to read and write the same notes, pick one with an MCP server (MCP server for notes lists the options; what is MCP explains the protocol). Best note taking app for AI compares what to look for.
How many notes do you need before it’s useful?
There’s no fixed number. Most people notice the first useful connections once a topic has a handful of linked permanent notes. Start with one topic you care about rather than everything at once.
Do I need note IDs like Luhmann’s?
No. Luhmann needed IDs because paper cards can’t link by title. In a notes app, a unique title works as the address.
What’s the difference between a Zettelkasten and a second brain?
A Zettelkasten is a method for developing ideas through linked notes. A second brain, in the popular sense, is a broader system for storing everything you might need. Many people use both: the Zettelkasten as the thinking part of a larger collection.
Where Valta fits
Valta is a vault of Markdown notes with [[wikilinks]] that Claude, ChatGPT, Cursor and any AI with MCP can read and write. It fits the Zettelkasten method well: you write a permanent note in your own words, say “save this”, and the AI files it in your vault with the links you choose. When you save a note, Valta suggests related notes to link, and the web app draws every vault as a graph so you can see the clusters forming.
No AI runs inside Valta. Your assistant does the work, you do the thinking, and every note stays plain Markdown you can export on any plan. The Free plan gives you one vault and up to 100 notes, enough to see if the habit sticks; see pricing for Pro. Start your free vault.