Which language is best in making of android applications.

Question

I want to know this bcoz as a beginner I have lot of questions about this.

Answer 1

java
kotlin

Answer 2

currently java with xml (for GUI) and in future kotlin will be used but that does not means java will not be used for android it will be continuing for at least a half or a decade unit kotlin becomes permanent replacement
I suggest you to learn java as it has many other advantages other than Android!