How do we know which type of class to use?

Question

Public, protected or private class?

Answer 1

If you think about what you want to do with the data you should know what type of class to use, you can take SoloLearn as an example, when you write a code it gives you the option to publish it [public], where anyone can see the code, make it private, where only you can see it, or (if we add an option) make it only visible to your followers [protected]