which are the best languages for app development?

Question

I want to know the languages I need to learn to develop good apps

Answer 1

Swift is developed by Apple and is exclusive to IOS.

Java has always been used for android development, but recently Google switched to Kotlin as the official language for android development. You can use either, but kotlin is recommended.

Learning the core concepts of xml is also useful.

Answer 2

JAVA and Kotlin for android
Swift for IOS