Obsidian Mastery February 20, 2026
The 5 Note Types Every Thinking Person Needs
This is Part 3 of the Obsidian Mastery Series. , Part 2 | Part 4,
One reason Obsidian vaults become unusable over time is that people treat all notes as fundamentally the same kind of thing. A shower thought and a fully-developed argument get filed the same way, updated with the same frequency, treated with the same level of completion.
When you open the vault later, you cannot tell what needs attention, what is finished, and what was never meant to be more than a placeholder. Everything looks like everything else. The confusion this creates is not a search problem, it is a design problem.
Different types of notes require different treatment: different levels of completeness, different update cadences, different roles in your overall system. A vault that does not make these distinctions forces you to figure out what kind of note you are looking at every time you open one. That friction adds up. That friction is why people stop using their vaults.
Here are the five note types that form the foundation of a functioning personal knowledge system.
1. The Fleeting Note
A fleeting note is a capture: an idea, observation, or fragment that arrived and needed somewhere to land before it disappeared. Fleeting notes are incomplete by design. They are meant to be processed, not to live permanently in the vault. They belong in your Inbox.
What it requires: Fast capture, no judgment, one sentence of context about why you saved it. That is all. Do not name them carefully or tag them thoroughly, capture should be cheap. Processing is where you invest the time.
Common mistake: Treating a fleeting note like a finished note adds overhead that makes capture feel expensive. When capture feels expensive, you capture less. Protect your capture rate by keeping fleeting notes truly temporary.
2. The Reference Note
A reference note stores information you want to retrieve but that does not require your original thinking, the specifications for a piece of software, a summary of a framework you use but did not develop, a person’s biography, a recipe. Reference notes are largely static: write them once, update them when the information changes.
What it requires: Accuracy and findability. These notes should be clearly titled so they surface in search. Keep them purely referential, if you have a reaction to the information, capture that reaction in a separate thinking note and link the two.
3. The Thinking Note
This is the most important note type and the one most people spend the least time on. A thinking note contains your original processing of an idea: your reaction to something you read, your position on a question you are working through, your observation about a pattern you have noticed.
What it requires: Time and an opinion. Thinking notes cannot be produced quickly. They are where the return on your PKM investment actually accumulates, each one is a piece of original thinking that is now preserved and retrievable rather than temporary and lost. Before you close a thinking note, it should contain at least one sentence starting with “I think,” “I disagree,” or “This means.”
4. The Project Note
A project note is a working document for something with a defined scope and outcome: a client deliverable, a piece of writing, a course you are developing. Project notes are active, they change frequently, accumulate material from multiple sources, and have a lifecycle that ends when the project ends.
What it requires: Heavy linking to thinking notes and reference notes. A project note should pull relevant material from across your vault, not try to contain everything itself. It is the synthesis point, not the storage point.
5. The Evergreen Note
An evergreen note is a thinking note that has been refined over time into a standalone, self-contained argument or idea, something you could hand to someone else and they would understand without needing the context of the conversation that produced it.
What it requires: Multiple passes of revision. Not every thinking note becomes evergreen, most remain partial and provisional. But the ones that do become your highest-value artifacts. They are what eventually becomes essays, talks, frameworks, products.
The Simple Convention That Makes It Work
You do not need a plugin or a complex tagging taxonomy. Add one word to the beginning of each note’s title to signal its type:
- , [title], Fleeting (or just leave in Inbox)
- REF: [title], Reference
- 💭 [title], Thinking
- , [title], Project
- 🌱 [title], Evergreen
Or simply keep a consistent folder or tag per type, whatever convention you will actually use. What matters is that when you open a note, you immediately know what kind of thing it is and therefore what it requires from you. That immediate clarity is the difference between a vault you avoid and a vault you return to.
Next in series: Linking Your Thinking: Building a Knowledge Network →
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