Best free websites to learn android app development for absolute beginner?

Build Your First App - a tutorial from Google, the creators of Android
https://developer.android.com/training/basics/firstapp/index.html?hl=p

Learn Android Basics (Get Started with your First Android App) from Adobe
https://www.adobeknowhow.com/courselanding/learn-basics-android-one-hour

Free Android Development Courses from udemy.com
https://www.udemy.com/topic/android-development/?price=price-free

Android Development For Absolute Beginners - Youtube Video Tutorials Series
https://www.youtube.com/playlist?list=PLB03EA9545DD188C3

Getting started with Android development - Tutorial from Vogella
http://www.vogella.com/tutorials/Android/article.html