Answer 1

For game development u have to learn java and then Android studio

Answer 2

Some threads with useful information about game development:
https://www.sololearn.com/discuss/1675813/?ref=app
https://www.sololearn.com/discuss/99903/?ref=app
https://www.sololearn.com/discuss/761432/?ref=app
https://www.sololearn.com/discuss/625747/?ref=app
https://www.sololearn.com/discuss/84093/?ref=app
https://www.sololearn.com/discuss/1342963/?ref=app
Please remember to use the search bar😊

Answer 3

After C++ directly start with java and do Android to save your time

Answer 4

For developing your own engine or using existing engines you can use c++.
C# for unity3D and other engines.
Java for native android games.
Javascript for browser games

But for most known languages are game frameworks/engines available.

Answer 5

Thanks! After I learn C++ I'll learn C, Objective C, Java, and C#.