Every guide is grouped by the constraint that actually decides the layout — plumbing under the sink, garment length in a closet, moisture in a basement, fire clearance in a garage.
Control the categories that spread easily—paper, cables, remotes, books, desk tools, gift wrap, and utility-drawer items—by giving each a clear decision rule.
Use a small, explicit category boundary instead of a catch-all container.
Separate active-use items from archives, spares, or obsolete items.