Technical Notes That Age Well

Good internal notes are not polished. They are accurate enough to trust, small enough to scan quickly, and blunt about the tradeoffs that mattered.

What survives

The notes worth keeping usually answer three questions:

1. What problem showed up?
2. What changed?
3. Why was that tradeoff acceptable at the time?

If those answers are written down clearly, future-you can recover the shape of the decision without reconstructing the entire week.