Based on your experience what is the best website for learning app development for all platforms (ios,android and windows)?

Question

In this question i would you all to kindly participate and contribute to help me in finding the best website or application for learning app development for all platforms (ios,android and windows). Your great answers are highly appreciated as it will help me in my new goal and in my path of learning the app development field

Answer 1

one website can not have all the information
so you should check various sites
*W3school
*tutorials point
*javaTpoint
*Udemy

Answer 2

ANDROID
www.androidauthority.com
www.codingwithmitch.com
developer.android.com

Answer 3

W3 schools and this app