Check Kotlin lang and google docs - there are online courses there as well as books: https://developer.android.com/kotlin https://developer.android.com/kotlin

Check Kotlin lang and google docs - there are online courses there as well as books: https://developer.android.com/kotlin https://developer.android.com/kotlin https://kotlinlang.org/docs/reference/android-overview.html https://kotlinlang.org/docs/reference/android-overview.html