Latest unofficial online app -w3schools tutorials
All in one online tutorials of(HTMl5 ,PHP,CSS,JAVASCRIPT,BOOTSTRAP 3,4 ,SQL,JQUERY,XML,ASP .NET,PYTHON)
->This app is completely online and smallest size of all existing w3school apps.
->This app covers all the web development requirements.
->This w3schools online tutorials app comes with a complete comprehensive and responsive layout