> ## 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

> Welcome to the CodeCrafters docs

> [card] [Challenges](https://docs.codecrafters.io/challenges/debug-test-failures.md)
>
> Common questions and troubleshooting challenges

> [card] [CLI](https://docs.codecrafters.io/cli/installation.md)
>
> How to install & use the CodeCrafters CLI

> [card] [Billing](https://docs.codecrafters.io/billing/get-an-invoice.md)
>
> Questions about invoices, billing, and access

> [card] [Forum](https://docs.codecrafters.io/community/forum-access.md)
>
> Questions about joining our forum

> [card] [Profile Pages](https://docs.codecrafters.io/profile-pages/where-is-my-profile-page.md)
>
> Finding and editing your profile page

## Most Popular Articles

Here are answers to the most frequently visited questions

> [card]
>
> How do challenges work?
>
> [Open](https://docs.codecrafters.io/challenges/how-challenges-work.md)

> [card]
>
> Can I re-attempt a challenge in a different language?
>
> [Open](https://docs.codecrafters.io/challenges/reattempt-challenge.md)

> [card]
>
> Can I install additional dependencies?
>
> [Open](https://docs.codecrafters.io/challenges/install-additional-dependencies.md)

> [card]
>
> How do I debug test failures?
>
> [Open](https://docs.codecrafters.io/challenges/debug-test-failures.md)

> [card]
>
> How do I debug test failures in the Redis Challenge?
>
> [Open](https://docs.codecrafters.io/challenges/debug-test-failures-redis.md)

> [card]
>
> How do I get an invoice?
>
> [Open](https://docs.codecrafters.io/billing/get-an-invoice.md)


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