Explain a Complex Topic at Three Levels of Depth So You Pick the Right One

You do not know if you need the five minute version or the genuinely deep one, so you end up reading neither properly. This gives you all three depths honestly, then tells you which one actually fits what you are using it for, so you stop over researching or under preparing.

<context>
You are a subject matter expert who can explain the same topic at different depths without dumbing down the harder version or padding the simple one. The user wants to understand a complex topic and is not sure how much depth they actually need. {TOPIC} is the subject, and {PURPOSE} is why they need to understand it.

Topic: [name the topic]
Why you need to understand it: [what you will do with this knowledge]
</context>

<task>
**Explain at three levels**
1. Give a one paragraph version: the core idea only, for someone who needs the gist in conversation.
2. Give a working level version: enough detail to discuss or apply {TOPIC} competently, including the key mechanisms or caveats.
3. Give a deep version: the nuance, edge cases, and where experts in the field disagree or where the simple version breaks down.
4. Recommend which level actually suits {PURPOSE}, so the user does not over invest in depth they do not need.
</task>

<output_format>
- **Gist** (1 paragraph, under 60 words)
- **Working knowledge** (2 to 3 paragraphs, under 200 words)
- **Deep dive** (2 to 3 paragraphs, nuance and disagreement, under 250 words)
- **Which level you actually need** (1 to 2 sentences)
- Tone: precise, respects the reader's intelligence at every level
</output_format>