Which is the first language to learn to start building apps ?

Answer 1

I'll suggest Java.

Answer 2

if you want to go with Android Development than start learning Java and Kotlin . check out the Udacity's course on Android Development they are free and taught be Google experts. Also check out the https://developer.android.com/index.html for more. There is also a course of IOS development available on Udacity. In my knowledge swift is used in Ios development. check out the SoloLearn's course on Swift

Answer 3

i meant computer language