Then the teacher tells you that most professionals don’t code this way anymore. So you start learning about classes, and instances, and instance variables, and

Then the teacher tells you that most professionals don’t code this way anymore. So you start learning about classes, and instances, and instance variables, and methods, and inheritance, and a whole bunch of other object-oriented programming concepts. Then you try to unlearn the way you originally learned to write code, and learn to write code in the new object-oriented way. Missing next line: "Then you get a job and your colleague tells you that most professionals don’t code this way anymore.