SOLID: Five basic principles of class design in Java

I think I'm having trouble understanding the difference between a class and a module. Would it be accurate to say they mean the same thing and are being used interchangeably in this article?

This was really overwhelming. I really got a grasp of this whole SOLID Process. It's so wonder seeing how classes can be seperated in an orderly manner. So challenging and demanding but doable. The thing is bringing all these together in a real application is not going to be an easy task. Well, like they say here at codegym repetition is the mother of all learning.