How do I apply the idea that tool documentation for yourself?

The most direct way to practice is through a focused exercise: Create your first tool documentation file today. Choose one tool you use daily — your text editor, your note-taking app, your terminal, your browser. Open a new document (plain text or Markdown) and write down everything that makes your current configuration different from the factory defaults. Include: the name and version of the tool, every setting you have changed from default (and why you changed it), every extension or plugin you have installed (and what each one does), every custom keybinding or shortcut (and what workflow it supports), and any configuration files or dotfiles involved (with their file paths). Do not try to be comprehensive across your entire stack. Document one tool thoroughly. This should take 20-40 minutes. When you finish, save the document in a location you will not lose — a dedicated folder in your notes system, a git repository, or a cloud-synced directory. Next week, document a second tool. Build the habit of documenting as you configure.

Common pitfall: The most common failure is the intention to document later. You spend an hour configuring a tool, getting everything precisely right, and tell yourself you will write it down when you are done. You never do. The configuration works, which removes the urgency. Documentation feels like overhead when the system is already functioning. Then six months later, when you need to recreate the setup on a new machine or recover from a crash, you discover that "I will remember this" was a lie you told yourself in a moment of false confidence. The second failure mode is over-documentation: writing such exhaustive, detailed documentation that maintaining it becomes a burden. You document every micro-setting, every pixel of your layout, every color code — and the document becomes so long and fragile that updating it after each small change feels disproportionate. The documentation falls out of sync with reality within weeks, and stale documentation is worse than no documentation because it gives you false confidence that you can recover a setup that no longer matches what is written down.

This practice connects to Phase 46 (Tool Mastery) — building it as a repeatable habit compounds over time.