How many languages do I need to build an news app???

Answer 1

If you want to make an android app, you will likely need to learn only Java, to use Android Studio.

And for iOS apps, you'll need to learn Swift and use an app like XCode.

Here are some links
https://www.instructables.com/id/How-To-Create-An-Android-App-With-Android-Studio/
https://codewithchris.com/how-to-make-iphone-apps-with-no-programming-experience/

Good luck!

Answer 2

and for webapp everything from 1(2) to x

Answer 3

what a bout python can i use it for backend and js for frontend for Android