> ## 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

<CardGroup cols={2}>
  <Card title="Challenges" icon={"rectangle-terminal"} href="/challenges/debug-test-failures">
    Common questions and troubleshooting challenges
  </Card>

  <Card title="CLI" icon={"message-code"} href="/cli/installation">
    How to install & use the CodeCrafters CLI
  </Card>

  <Card title="Billing" icon={"file-invoice"} href="/billing/get-an-invoice">
    Questions about invoices, billing, and access
  </Card>

  <Card title="Forum" icon={"people-group"} href="/community/forum-access">
    Questions about joining our forum
  </Card>

  <Card title="Profile Pages" icon={"square-user"} href="/profile-pages/where-is-my-profile-page">
    Finding and editing your profile page
  </Card>
</CardGroup>

## Most Popular Articles

Here are answers to the most frequently visited questions

<CardGroup cols={2}>
  <Card icon={"file-lines"} href="/challenges/how-challenges-work">
    How do challenges work?
  </Card>

  <Card icon={"file-lines"} href="/challenges/reattempt-challenge">
    Can I re-attempt a challenge in a different language?
  </Card>

  <Card icon={"file-lines"} href="challenges/install-additional-dependencies">
    Can I install additional dependencies?
  </Card>

  <Card icon={"file-lines"} href="/challenges/debug-test-failures">
    How do I debug test failures?
  </Card>

  <Card icon={"file-lines"} href="/challenges/debug-test-failures-redis">
    How do I debug test failures in the Redis Challenge?
  </Card>

  <Card icon={"file-lines"} href="/billing/get-an-invoice">
    How do I get an invoice?
  </Card>
</CardGroup>