Top Level Folders and files
In the Project view you will see three or four top level folders : manifests, java, java(generated), & res.
If you double click on the "Manifests" folder you will see AndroidManifest.xml, this contains the components in your app and is read by the android runtime system when you execute your application. Expand Java and your java language files are organized here.
drawable: This displays all of your apps images
layout: Contains the UI files for your activities
menu: Contains XML files describing any menus in your app
mipmpap: Contains the launcher icons for your app
navigation: Contains the navigation graph which tells the platform how to navigate between different parts of your application
Values: Contains resources like strings & colors used in your app