• Some sources for learning Android Studio:
• One of the finest places to learn about Android app development is developer.android.com. It's Android's own website, and it's the most up-to-date resource you'll find. One of the lesser-known features is a complete how-to on Android app development using best practises.
• Vogella is jam-packed with in-depth tutorials on some of Android's more sophisticated topics. It includes a large library of free Android tutorials that cover everything from the fundamentals to more advanced topics.
• One of the best resources for learning Android app development is Technotalkative. Paresh Mayani manages this website. He has gathered all of the articles and tutorials. He's put everything he's made for Android in one place.

Read More: Which Android Studio file is most of the app coding done in?