# Project Structure
## Basic Structure
```
my-book/
├── book.json # Configuration (optional)
├── README.md # Introduction
├── SUMMARY.md # Table of contents
├── chapter1.md
├── chapter2/
│ ├── README.md # Chapter 2 intro
│ ├── section1.md
│ └── section2.md
├── assets/
│ └── images/
└── styles/
└── website.css # Custom styles
```
## Required Files
### SUMMARY.md
Defines the table of contents and navigation structure:
```markdown
# Summary
* [Introduction](README.md)
* [Getting Started](getting-started.md)
* [Advanced Topics](advanced/README.md)
* [Topic 1](advanced/topic1.md)
* [Topic 2](advanced/topic2.md)
```
### README.md
The introduction page, becomes `index.html`.
## Optional Files
### book.json
Configuration file. See [Configuration](config.md).
### GLOSSARY.md
Define terms that are automatically linked throughout your book:
```markdown
## API
Application Programming Interface
## HTML
HyperText Markup Language
```
Terms appear as tooltips when hovered. See [Glossary](features/glossary.md).
### LANGS.md
For multi-language books:
```markdown
# Languages
* [English](en/)
* [日本語](ja/)
```
## Assets
Place images and other assets in an `assets/` folder:
```
```
Relative paths are also supported:
```
```