Notes are not fixed once written, and a system that treats them as static quickly becomes stale. Note refactoring is the ongoing work of improving notes by splitting, merging, renaming, or clarifying them, and it is what keeps a knowledge base usable as it grows. The most common mistake is the assumption that a note, once filed, is finished; in reality, many notes only reveal their true shape after they have been revisited several times and connected to neighbors. Refactoring is the bridge between raw capture and a polished evergreen note, and it is also how maps of content gradually grow into genuine outlines of your thinking on a topic.
The deeper purpose of refactoring is knowledge synthesis, the combination of multiple notes into a clearer conclusion or framework. Without synthesis, note-taking collapses into collection: notes accumulate without ever producing summaries, decisions, or new understanding. Synthesis is where stored information turns into original thought, and it usually emerges from connecting evergreen notes through a map of content or a short written argument that draws on them. Practicing synthesis on a small realistic example, articulating the conclusion out loud, and then checking whether the result actually advances your understanding is the same general pattern that recurs across the system: try it small, reason about it explicitly, and judge it by whether it solves the problem at hand.