How to start learning the Kotlin language for Android development?

Question

Android

I know that development for buckets is very extensive.
1) But where to start when there are so many different things?
I know for sure that I will work with all kinds of interfaces such as bluetooth, Wi-Fi (is this a peripheral?).
Clearly, the first point is OOP.
2) But then what?
3) Is JAVA needed if kotlin is official for android?

Answer 1

1) From the Java textbook
2) Tutorials specifically for Android, then studying Kotlin from the documentation
3) Need

Answer 2

Switching to Kotlin after 5000+ hours in Java