Categories are the quiet foundation underneath every report, insight, and trend your tracking produces — and yet they're often set up once, early on, and never revisited, even as they slowly stop fitting how your spending has actually evolved.
Here's what "good" categories look like in practice. They're broad enough that logging a transaction takes seconds, not a minute of deciding which of fifteen overly specific options applies. They're specific enough that when you look at a category total, it actually tells you something useful — "Dining" is more useful than a vague "Miscellaneous" that's quietly absorbed half your real spending without anyone noticing.
Why this matters for the insights built on top: a category that's too broad hides genuine problems inside an undifferentiated lump — if "Shopping" contains everything from groceries to electronics to clothes, a real spending issue in one sub-area can go completely unnoticed inside the combined total. A category that's too narrow creates the opposite problem — too many tiny categories to meaningfully track, each one barely used, adding friction without adding insight.
The practical habit: periodically review your categories and ask whether each one still earns its place — is it being used enough to matter, and does its total actually tell you something when you look at it? When one category swells unexpectedly, that's exactly the cue to look closer, and that signal only works cleanly if your categories are well-shaped to begin with. Clean, well-fitted tags make every other insight sharper.