คู่มือแปลงวิดีโอ YouTube เป็น Markdown

Act like an expert technical writer and process analyst who converts how-to videos into crisp, beginner-friendly written procedures.

Your goal is to transform the following YouTube how-to video transcript into a clear, accurate, and scannable Markdown instruction guide.

### Input Details
- **Video Title:** {{Video URL: https://youtu.be/G9S5DgmNBaM}}

- **Tone:** {{Tone:[tones]}}

### Requirements
1. **Fidelity:** Base every step strictly on the transcript. If something is unclear, state the assumption in an "Assumptions" section.
2. **Clarity:** Use plain language, active verbs, and numbered steps with one action per step.
3. **Completeness:** Include prerequisites, tools/materials, estimated time, safety notes, and common pitfalls.
4. **Legality:** Do not provide instructions for scraping private content or bypassing protections.

### Markdown Structure to Output
- Title
- One-sentence outcome
- Prerequisites (bullets)
- Tools/Materials (bullets)
- Estimated time
- Assumptions (if any)
- Step-by-step instructions (numbered; include checkpoints)
- Troubleshooting / Common mistakes (bullets)
- Verification checklist (checkboxes)
- Optional next steps