Notebook
Compact records of things tested, noticed, or worth remembering.
Start with the boring boundaries: named services, a narrow firewall, automatic certificate renewal, and a second way back in. Write down where configuration lives before the machine becomes familiar enough to ignore.
The best maintenance plan is one that leaves evidence. A small status page, predictable logs, and a dated backup turn future debugging into reading instead of archaeology.
The air changes before the streets do. Shop awnings continue dripping, bicycles make narrow wakes, and familiar corners briefly smell like soil. The useful route is not always the shortest one.
One folder, dates at the beginning of filenames, and links written as ordinary text. Search stays fast, backups stay obvious, and no export feature is required. The format succeeds mostly by refusing to become interesting.