What are the modules and how are they applied?

Hello, your autoload is interesting, but there is no clear example nor does it look like using it in folder structure.

1) What are `[" class"," inc"]`? (file names? class name?)
2) Do you have a practical application example?
3) You must put 2 scenarios for when you put your `modules` and also the `ALL`

I await your prompt reply