What steps to follow to become a good andriod developer.

Answer 1

https://developer.android.com/guide/
If you're familiar with Android development (or after you've completed the course(s) posted in the above link):
https://medium.com/mindorks/android-development-best-practices-83c94b027fd3
https://developer.android.com/distribute/best-practices/

Answer 2

First of all, you need to learn. You can learn on SoloLearn. Next you need to practice everyday. Good luck!