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+## Step 1: Prepare your modern multi-tier application exercise
+
+Welcome to your **"Build applications with GitHub Copilot agent mode"** exercise! :robot:
+
+In this exercise, you will build a **modern multi-tier application** for OctoFit Tracker:
+
+- **Presentation tier:** React 19
+- **Logic tier:** Node.js + Express + TypeScript
+- **Data tier:** MongoDB
+
+### :keyboard: Activity: Create and publish your working branch
+
+1. Open your Codespace for your repository copy.
+
+1. Open Copilot Chat and switch to **Agent** mode.
+
+1. Run this prompt:
+
+   > ![Static Badge](https://img.shields.io/badge/-Prompt-text?style=flat-square&logo=github%20copilot&labelColor=512a97&color=ecd8ff)
+   >
+   > ```prompt
+   > Please create and publish a new Git branch called build-octofit-app
+   > ```
+
+1. Confirm the active branch is `build-octofit-app`.
+
+1. Wait for Mona to post the next step.
+
+<details>
+<summary>Having trouble? 🤷</summary><br/>
+
+- Make sure the branch name is exactly `build-octofit-app`.
+- Make sure the branch is pushed to your repository.
+
+</details>