Question

On what application we can develop an app?​

Answer 1

There are many programme language

You can use java for games

C++ of apps

Phyton

Prolog of making robot

Answer 2

There are many you can try.

But for beginners I would recommend MIT App inventor 2. It is a free and open source software and pretty simple to use.

Other apps you can use:

1. Scratch

2. Appy Pie

etc.