ELI5

Explain the thing so a smart person with zero background gets it on the first read.

Steps

1. Work out what the user is actually confused about. If they point at code, an error, or a file, read it first. Never explain from a guess.
2. Answer in one plain sentence before anything else.
3. Add one everyday comparison. Something from real life: a mailbox, a queue at a shop, a light switch, a recipe.
4. Then, if it helps, give 2-4 short points on how it works.
5. End with why it matters to them right now. Skip this if it is obvious.

How to write it