Simple explanation
Welcome to Day 12. Everything up to today has been about using Claude Code better in a single session. Today you break that limitation entirely. The idea When Auto Mode is running — Claude Code is working. You are watching. That is wasted time. Multi-clauding means: while Session 1 is building one thing — you start Session 2 building something else. Both running. Both building. Neither waiting for you. You go from one builder to two builders. In five minutes. For free. How to set it up Session 1 — your main task: 1. Open Terminal or Command Prompt. 2. Navigate to your project folder. 3. Type claude to start. 4. Press Shift + Tab once for Auto Mode. 5. Give Claude Code a substantial task. Example: "Build a complete resources page with three sections — tools, guides, and templates. Each section has a heading and three placeholder cards." Session 2 — a parallel task: 1. Open a second Terminal or Command Prompt window. 2. Navigate to the same project folder — or a different one. 3. Type claude to start a new session. 4. Give this session a different task. Example: "Write five headline options for my homepage hero section — each one targeting a non-technical founder who wants to build with AI." Both sessions are now running. Both producing results.
What to do
The one rule for multi-clauding Never run two sessions that edit the same file at the same time. If two sessions touch the same file simultaneously — they overwrite each other's work. Use separate branches for each session to be completely safe. What to use parallel sessions for: — Session 1: Building a new page / Session 2: Writing content for a different page — Session 1: Fixing a bug on the homepage / Session 2: Building a new feature on the contact page — Session 1: Creating a new lesson / Session 2: Updating the navigation — Session 1: Building a paid kit page / Session 2: Writing the email sequence for new subscribers Today's practical task 1. Create two GitHub branches — one called "day-12-session-1" and one called "day-12-session-2." 2. Open two terminal windows. 3. Start a Claude Code session in each. 4. Turn on Auto Mode in both. 5. Give each session a different task on a different part of your site. 6. Watch both build simultaneously. 7. Review both results. 8. Merge whichever ones you want to keep. Today's result: You now build twice as fast as you did yesterday. That advantage compounds every single day from here.
Copy-paste prompt
Run in auto mode. [Session 1 task]: Build a [describe what you want built] with [describe the sections and content]. Match the existing site design exactly. Do not change any other files. Work on branch "day-12-session-1" only.
Course note
Key takeaway
Open a second terminal window, start a second Claude Code session, and give it a different task. One rule: never edit the same file from two sessions at once. Use separate branches for each session. You go from one builder to two — for free.