Teaching technical subjects to people meeting them for the first time.
Teaching is the fastest way I know to find out whether you actually understand something. Children in particular ask the questions adults are too polite to ask — the ones that go straight to the part you were hoping to skip over.
That instinct shapes how I document my own work. Every significant failure in the platform behind this site is written up with the symptom, the diagnostic steps, the wrong turns, and the root cause. Not a summary — the actual reasoning.
A fuller account of my teaching background is being written up.