I followed following link to get started with react-native
Getting started with react native
I tried to create native app without expo so i as per documentation i followed following command
npm install -g react-native-cli
react-native init AwesomeProject
After run android command
react-native run-android
It gave me following error on emulator
So i used start command to run metro server
react-native start
This command gave me another error in console
Its compatibility issue of Nodejs I uninstalled my Node(12.11) and installed Node(10) stable version and it worked perfectly.