1. Rename the app name from Res>>value>>String.
2. Change all the colours of the app.
3. Change the application icon.
4. Change the Splash Screen make up optional.
5. Rename package name through android Manifest file with ctrl + F6 and also change the name at android project file.
7. Change About Info the app information.
8. Change the Privacy Policy of the app..
9. Add Visibility Gone to hide some buttons or image.
10. Change the Admob id().
11. Change the Firebase parameters if any and download fresh json file.
12. Check for insert code or keys or url if any.
13. Install and configure admin panel if any.