Object-oriented programming Courses
University of Michigan via Coursera Coding a Chess Game with Stockfish API - JavaScript Tutorial
freeCodeCamp Difference Between Copy Constructor and Assignment Operator in C++ - OOP Tutorial
CodeBeauty via YouTube Write SOLID Code & Impress your Friends
SymfonyCasts phpspec: Testing... *Designing* with a Bite
SymfonyCasts JavaScript for PHP Geeks: ES6/ES2015 (New JavaScript)
SymfonyCasts OOP (course 4): Static methods, Namespaces, Exceptions & Traits! Woh!
SymfonyCasts OOP (course 3): Inheritance, Abstract Classes, Interfaces and other amazing things
SymfonyCasts OOP (Course 2): Services, Dependency Injection and Containers
SymfonyCasts Object Oriented Programming (Course 1)
SymfonyCasts