Which programming language is helpful in developing mobile apps and also for web development

Answer 1

I think you should check out this first
https://www.sololearn.com/Discuss/1119559/?ref=app

Answer 2

Python3 and Django for building strong and very rich website ( flask is used for small website,but Django for everything)

kivy ( a Python Program for anroid )is used for making android apps.

Answer 3

I just wanted to point out about a Dart.
It's home page describes it this way:

'Dart is an application programming language that's easy to learn, easy to scale, and deployable everywhere'

This programming language is getting popular mainly in mobile applications, with the help of the Flutter framework.
You can create a source code that will run both in android and iOs.

You can also use Dart in the web.

Answer 4

For mobile development it's Java and Kotlin.

Answer 5

You need to learn java or kotlin for developing native android apps