Reading docs and building stuff is the best way to build anything. So we would following the same.
First of all plug you mobile into the system via a USB cable and run the cmd adb devices to check if it is properly working.
Open your terminal and write this command to make your first react-native app.
npx react-native@latest init FirstApp
Go inside the directory using the command:
cd FirstApp
Now write the command to install and run the app on your android phone:
npx react-native run-android
Proceed with the permission if asked in the mobile phone. This shall run the app on your Android device.
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