If you’re a fan of using Getting Things Done to stay on top of all the, well, things you need to get done – you’ll love How to Take Smart Notes for staying on top of all the things you want to learn. I’ll give you an introduction – in my own words – in this How to Take Smart Notes book summary. The note-taking system introduced in Sönke Ahrens’s How to Take Smart Notes is a bit like Getting Things Done for learning. GTD is great for things that have a clear objective. But creative insights can’t be planned, by definition. That’s the point of an insight, it comes out of nowhere. One of my favorite quotes from the book: It is a huge misunderstanding that the only alternative to planning is aimless messing around. The challenge is to structure one’s workflow in a way that insight and new ideas can become the driving forces that push us forward. —Sönke Ahrens In other words, you can’t plan an insight, but you can structure the way you read and learn in a way that not only improves your retention, but that also leads you to new insights. What is a Zettelkasten? The system introduced in How to Take Smart Notes is called a Zettelkasten, which is German for “slip box.” A slip box was originally a box full of slips of paper, each slip with a little note on it. The slips were arranged and annotated in a certain way to facilitate thinking and to link ideas. The most famous user of the Zettelkasten was a German sociologist named Niklas Luhmann. Luhmann credited his slip box for his prolific career, in which he published 58 books and hundreds of articles. His actual Zettelkasten is being studied in a long-term project at the University of Bielefeld, in Germany. The linking, keyword, and organization characteristics of a slip box were a precursor to our modern-day internet. But now that we’re no longer limited to slips of paper, writers and researchers are adapting the Zettelkasten technique to digital tools. How do you take smart notes? There are four basic steps to follow to make smart notes for your own Zettelkasten – or “slip box”, if you prefer: Make fleeting notes: Always have a way to capture ideas that pop into your mind, or – if reading – read actively, highlighting and taking notes. I personally carry around a tiny notebook, and use the Drafts app on iOS to capture quick thoughts. I don’t take notes while I read, but I do highlight on my Kindle. Make literature notes: Rewrite the important parts of what you’ve read. But, do it in your own words. It sounds pointless, but it’s surprisingly fun, and later on we’ll get to how it helps you learn better. Make permanent notes: Break any literature notes or fleeting notes down to individual notes. Do this only for the most important ideas – the ones that are relevant to your interests and your ongoing projects. Do this a little bit each day, so you don’t get a huge backlog. Add permanent notes to the slip box: Luhmann used a special branched numbering system to organize his notes. I prefer plain-English note titles. You also want to add relevant tags to each note, and link your note to related notes. How to use your smart notes for learning and writing The main reason to have a system like this is to direct your curiosity in a productive way, and turn your learning into writing. There are three things you’ll do with your slip box: Develop topics: As you make new notes, themes will start to develop around your areas of interest. You can interact with your notes to follow the links, and you’ll see holes in your knowledge to guide your learning. Getting research/writing ideas: You’ll never have to wonder again what you’d like to read about or write about. It will be clear from where there are lots of notes clustered around a topic in your slip box. For example, you may have many notes with a certain tag, or if you use a piece of software such as Obsidian you can visualize which notes link to one another to see patterns in your thinking. Turn your notes into writing: You can collect yo