> ## Documentation Index
> Fetch the complete documentation index at: https://docs.codecrafters.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Learn about what Concepts are, and how to create them.

<Note>
  Concept creation is currently invite-only. Interested in building CodeCrafters
  concepts? Write to us at <b>[hello@codecrafters.io](mailto:hello@codecrafters.io)</b>.
</Note>

Concepts are interactive tutorials that teach users concepts related to our [Challenges](https://app.codecrafters.io/catalog).

Here's an [example](https://app.codecrafters.io/concepts/network-protocols).

Concepts are a first-class citizen on CodeCrafters. We put a lot of effort into making sure that they're high quality and engaging.

Read on to learn more about creating Concepts.

* [How concepts work](/contributors/authoring-concepts/how-concepts-work)
* [Choosing concepts](/contributors/authoring-concepts/choosing-concepts)
* [Creating concepts](/contributors/authoring-concepts/creating-concepts)
* [Testing concepts](/contributors/authoring-concepts/testing-concepts)
* [Publishing concepts](/contributors/authoring-concepts/publishing-concepts)