Steps for creating development environment for react native apps.
1.	Install vs code
2.	Install node version greater than 12.
3.	As a new mobile app developer use expo which is set of tools build around react native. 
4.	Use command “npm I –g expo-cli” to install expo in vs code
5.	Now to build your first react native apps “expo init projectname”
6.	Later use npm start to see your app running in browser window on localhost
7.	Install expo client in your android, scan code available on localhost using expo client app.
8.	Now try to make changes in app.js file and observe results in your android phone.
9.	Now for android simulator: