Data Types, Arrays, OOPS Concepts, String handling, Packages, Access modifiers, Exception Handling, Multi Threading, Collections, Inner Classes.
Architecture, Activity, Broadcast receivers, Content providers, Services, Manifest.xml, Layouts, Emulator, UI Design, Menu, Activity Lifecycle, Intents, Styles, Fragments and Fragment Lifecycle, SQLite, Shared Preferences, Adapters, Multimedia, Firebase Cloud Messaging(FCM), Signed Apk, Upload to playstore.