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> **Note**: Make sure you have completed the [React Native - Environment Setup](https://reactnative.dev/docs/environment-setup) instructions till "Creating a new application" step, before proceeding.
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## Step 1: Start the Metro Server
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First, you will need to start **Metro**, the JavaScript _bundler_ that ships _with_ React Native.
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To start Metro, run the following command from the _root_ of your React Native project:
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```bash
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# using npm
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npm start
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```
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```bash
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# OR using Yarn
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yarn start
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```
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## Step 2: Start your Application
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Let Metro Bundler run in its _own_ terminal. Open a _new_ terminal from the _root_ of your React Native project. Run the following command to start your _Android_ or _iOS_ app:
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### For Android
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```bash
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# using npm
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npm run android
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```
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```bash
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# OR using Yarn
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yarn android
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```
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### For iOS
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```bash
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# using npm
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npm run ios
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```
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```bash
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# OR using Yarn
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yarn ios
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```
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If everything is set up _correctly_, you should see your new app running in your _Android Emulator_ or _iOS Simulator_ shortly provided you have set up your emulator/simulator correctly.
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This is one way to run your app — you can also run it directly from within Android Studio and Xcode respectively.
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## Step 3: Modifying your App
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Now that you have successfully run the app, let's modify it.
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1. Open `App.tsx` in your text editor of choice and edit some lines.
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2. For **Android**: Press the <kbd>R</kbd> key twice or select **"Reload"** from the **Developer Menu** (<kbd>Ctrl</kbd> + <kbd>M</kbd> (on Window and Linux) or <kbd>Cmd ⌘</kbd> + <kbd>M</kbd> (on macOS)) to see your changes!
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For **iOS**: Hit <kbd>Cmd ⌘</kbd> + <kbd>R</kbd> in your iOS Simulator to reload the app and see your changes!
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## Congratulations! :tada:
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You've successfully run and modified your Expo App. :partying_face:
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