0.1: Installation

Prerequisites

Before installing Claude Code, make sure you have:

• Claude Pro or Max subscription ($20/month for Pro)
• Operating System: Mac (10.15+), Windows 10+, or Linux (Ubuntu 20.04+)
• RAM: 4GB minimum
• Internet connection

No coding tools required! Claude Code handles everything—you don’t need to install programming languages or development environments.

Installation Commands

Mac/Linux

Open Terminal and run:

curl -fsSL https://claude.ai/install.sh | bash

Mac (Homebrew)

If you use Homebrew:

brew install --cask claude-code

Windows

Open PowerShell (as Administrator) and run:

irm https://claude.ai/install.ps1 | iex

Verify Installation

After installation completes, verify it worked:

claude --version

You should see a version number like claude 1.x.x.

Authentication

The first time you run Claude Code, you’ll need to authenticate:

1. Run claude in your terminal
2. Select “Claude account with subscription”
3. Your browser will open for authentication
4. Complete the sign-in process
5. Return to terminal—you’re ready!

Troubleshooting

”command not found” error

On Mac/Linux:

• Close and reopen your terminal
• Or run: source ~/.bashrc (or ~/.zshrc for Zsh)

On Windows:

• Close and reopen PowerShell
• Make sure you ran PowerShell as Administrator

”Subscription required” error

Claude Code requires a paid subscription. Visit claude.ai to upgrade.

Permission issues

Mac/Linux:

chmod +x /usr/local/bin/claude

Windows:

• Ensure PowerShell is running as Administrator

General diagnostics

Run the doctor command:

/doctor

This checks your installation and reports any issues.

Command Reference

Next up: Download the course materials so you can start learning interactively.