Chapter Formatting Skill

Instructions

1. Numbering Convention

All chapters follow a hierarchical numbering system:

Module X.Y.Z — Title
│
├── X = Module number (1-4)
├── Y = Week number within module
└── Z = Section number within week (optional)

Examples:
- Module 1.1 — Introduction to Physical AI
- Module 1.2.1 — ROS 2 Node Basics
- Module 2.3 — Unity Visualization Setup

2. File Naming Convention

docs/
├── module-1/
│   ├── _category_.json          # Module metadata
│   ├── index.mdx                # Module overview (1.0)
│   ├── week-1-2/
│   │   ├── _category_.json
│   │   ├── index.mdx            # Week overview (1.1)
│   │   ├── 01-embodied-ai.mdx   # Section 1.1.1
│   │   ├── 02-humanoid-overview.mdx  # Section 1.1.2
│   │   └── 03-sensors.mdx       # Section 1.1.3
│   └── week-3-5/
│       ├── index.mdx            # Week overview (1.2)
│       ├── 01-nodes.mdx
│       ├── 02-topics.mdx
│       └── 03-services.mdx

3. Frontmatter Standard

Every MDX file MUST have:

yaml

---
title: "1.2.1 — ROS 2 Node Basics"
sidebar_label: "1.2.1 Node Basics"
sidebar_position: 1
description: "Learn the fundamentals of ROS 2 nodes and how to create them with Python"
module: 1
week: 3
section: 1
tags: [ros2, nodes, python, rclpy, beginner]
difficulty: beginner  # beginner | intermediate | advanced
estimated_time: "30 minutes"
---

4. Section Ordering

Every chapter follows this exact order:

markdown

# [Number] — [Title]

> **Summary**: One-sentence description of what you'll learn.

## 🎯 Learning Objectives
- Objective 1
- Objective 2
- Objective 3

## 📋 Prerequisites
- [Link to required prior chapter]
- Required software/tools

## 📖 Content
### Topic 1
...
### Topic 2
...

## 💻 Hands-On Exercise
### Exercise 1: [Name]
**Difficulty**: ⭐ Beginner
...

## 🔑 Key Takeaways
- Takeaway 1
- Takeaway 2

## 📚 Further Reading
- [External resource 1]
- [External resource 2]

## ➡️ Next Steps
Continue to [Next Chapter Title](/path/to/next)

5. Sidebar Category Files

Each folder needs _category_.json:

json

{
  "label": "Module 1: ROS 2 Fundamentals",
  "position": 1,
  "collapsible": true,
  "collapsed": false,
  "link": {
    "type": "doc",
    "id": "module-1/index"
  }
}

6. Cross-Reference Format

Always use consistent link format:

markdown

✅ Correct:
See [1.2.1 — Node Basics](/docs/module-1/week-3-5/01-nodes) for details.

❌ Wrong:
See the nodes chapter for details.
See [here](/docs/module-1/week-3-5/01-nodes) for details.

7. Difficulty Indicators

Use consistent emoji markers:

Level	Emoji	Badge
Beginner	⭐	`difficulty: beginner`
Intermediate	⭐⭐	`difficulty: intermediate`
Advanced	⭐⭐⭐	`difficulty: advanced`

Examples

Module Index Page

mdx

---
title: "Module 1 — The Robotic Nervous System"
sidebar_label: "Module 1: ROS 2"
sidebar_position: 1
description: "Master ROS 2 middleware for robot control"
module: 1
tags: [ros2, middleware, robotics]
---

# Module 1 — The Robotic Nervous System (ROS 2)

> **Focus**: Middleware for robot control

## 🎯 Module Overview

In this module, you will learn...

## 📅 Weekly Schedule

| Week | Topics | Difficulty |
|------|--------|------------|
| 1-2 | [Intro to Physical AI](/docs/module-1/week-1-2/) | ⭐ |
| 3-5 | [ROS 2 Fundamentals](/docs/module-1/week-3-5/) | ⭐⭐ |

## 🏆 Module Outcomes

By completing this module, you will be able to:
- Create ROS 2 nodes using Python
- Implement publish-subscribe patterns
- Understand URDF for humanoid robots

Validation Checklist

All files have correct numbering in title
sidebar_position matches intended order
Frontmatter includes all required fields
Cross-references use full chapter numbers
Difficulty levels are marked
_category_.json exists in each folder

Definition of Done

Every chapter follows the numbering convention (X.Y.Z)
All frontmatter fields present and consistent
Sidebar renders in correct order
Cross-references use chapter numbers
No orphan pages (all linked in sidebar)

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SKILL.md