Object-oriented programming (OOP) is a programming paradigm. Not only used in C++ (or game).
OOP is an thinking for programming.
Read more books and do some small projects or examples. U will make sense about OOP (including 继承、派生、虚函数).
By the way, game programming use lots of techincal/knowledge. Depends on the project. But U have to learn C++, because it is a door to open u mind and ready to join OOP programming world.
PS: I can't type chinese in my office computer, sorry about that. ~_~