1 All Kotlin Documents https://kotlinlang.org/docs/home.html

2 Kotlin For Android https://developer.android.com/kotlin/first

3 Android Documents https://developer.android.com/guide

4 About Android Studio https://developer.android.com/studio/intro

5 To Download Android Studio https://developer.android.com/studio

6 Firebase https://firebase.google.com/

7 Gradles Signing Report https://developers.google.com/android/guides/client-auth