title: Does everything go inside a class?
body: <p>I have another rudimentary question. I somewhat recall hearing that everything in C++ goes inside a class. Then I hear that classes shouldn't be used where possible. So my question goes: When do you make classes and when do you not? (an example or two would be cool)</p>
  
  <p>And a random side-question: When is it appropriate to put 2 classes in one header? Or does it matter?</p>