Object-oriented programming Courses
IBM via Cognitive Class Tour of Scala
Independent Scala at Light Speed
Independent Learn Object Oriented Programming in Python - OOP Training
Simon Sez IT via YouTube JavaScript: The Hard Parts, v2
Frontend Masters Intermediate Python
Frontend Masters The Hard Parts of Object Oriented JavaScript
Frontend Masters The Good Parts of JavaScript and the Web
Frontend Masters A Complete Introduction to PHP
egghead.io Understanding JavaScript's Prototypal Inheritance
egghead.io