Adam Akhtar of Highfive has a great—albeit surprisingly simple—tip to add visual tags to your notebook or moleskin for organizing your notes. All it takes is your notebook and a pen:
The back of your notebook will act like a tag list or index. Every time you create a new entry at the front of the book you’re going to “tag” it [in the back]…
Now you’d go back to the first page where the [note] is and on the exact same line as the…label you just wrote you’d make a little mark on the right edge. You’d make this mark so that even when the notepad was closed the mark would be visible. After repeating this for various [notes] you’d now have various tags visible on the notebooks edge.
The process is very easy to use, and can be paired with other “hacks” for an added organizational boost (like using different colors for different topics). If you still use a physical notebook, this is one approach you’re definitely going to want to consider.