Understand something well enough to present it tomorrow

I have to explain [THE THING] to [WHO — your board, your team, a client, your kid] on [WHEN]. I half understand it. Half is not enough to stand in front of people with.

Don't give me a summary. Teach me to the point where I could handle a question I didn't prepare for.

1. THE ONE-SENTENCE VERSION. What this actually is, with no jargon and no analogy yet.

2. THE ANALOGY, and where it breaks. Every analogy is a loan against accuracy — tell me what I'm giving up by using it, so I don't get caught extending it too far.

3. WHY IT EXISTS. What was broken or missing before this. Nothing makes sense until I know what problem it was answering.

4. THE THREE QUESTIONS I'LL GET. Specifically from [WHO], given what they care about. Answer each in the words I'd actually say out loud, not in written prose.

5. THE QUESTION I CAN'T ANSWER. There'll be at least one. Tell me what it is and give me the honest response — the one that says what I don't know without making me look unprepared.

6. THE THING I'LL GET WRONG. Based on how people usually misunderstand this, what am I most likely to say confidently and incorrectly?

Then test me: ask me to explain it back in three sentences, and correct what I get wrong.

One more thing: use anything you already know about me from our past chats and anything you're connected to. If you can find it yourself, don't make me look it up.