[racket] Question about package, library and module

Hi there,
It is not quite clear to me how package, library and modules
relate together.


I suppose that a package as well as a library may contain 1 or more
modules. It is not quite clear to me (if my first assumption is
correct) they have to contain at least one module.
 

I further assume that, e.g.  (require something) imports a module named
something. The next question is where and how to set a module path.


Would be nice to get a conceptual overview or if my question shows my
inability to read documentation a pointer to the documentation would be
appreciated.




-- 
Thanks,
Manfred