You can install expo app on your device. This will help you with the live preview of application:
Playstore:- https://play.google.com/store/apps/details?id=host.exp.exponent&hl=en_IN&gl=US
AppStore:- https://apps.apple.com/us/app/expo-go/id982107779
Firstly install nodeJs: https://nodejs.org/en/
Install yarn: npm install --global yarn
yarn install
yarn add <package_name>
yarn remove <package_name>
expo start
After that, scan the given qr code in expo app, and enjoy developing apps 🙌