What language do I need to learn to be able to design mobile applications?

Question

I want to build apps

Answer 1

In general, you should go for Java or Kotlin for Android and Swift or Objective C for iOS -- those are considered native languages of the two operating systems, respectively.

Another option would be to go for C# and use Xamarin framework for Android, iOS or Windows.

Answer 2

Oooh
Thanks Kuba Siekierzyński

Answer 3

Look Dart and flutter