How to start learning android app and game development?

Question

I know c++ and java.
I am very determined to learn Android from scratch to expert level.
i just need a good mentor.
i need help with these things(for Android development)
1) what languages shud i learn.
2) I am a beginner with no knowledge. Please help me from the very first level.
2) where can i get free full course to learn Android?
3) How much time should i allocate?
4) For android games, i plan to learn Unity3d. From where can i get the resources to learn Unity3d for android.

Answer 1

https://www.sololearn.com/Discuss/625747/?ref=app