How i learn android?

Question

send me sum basic codes

Answer 1

well the basic pin code to my android lock screen is 4201...

Answer 2

What do you mean by learning android?
Android is a OS, it's built upon Java and C++ if you want to learn to make apps i suggest you to pick either, Java is probably a good start.

Answer 3

here's a good site: https://developer.android.com/training/index.html