[Dev-C++] what is a resource? how do I create my own headers?

[Alan T. <ala...@3n...>]

Two questions:

(a)  What is a "resource" file?  Is it relevant for a [DOS] console program?
Where is it documented what to do with a resource file?

            I created a new project (console application) and added three
existing files (two cpp{one with a main function, another with other
functions} and one header file.  Asked it to Compile the project, but it
gave me an error with the resources ("no resources").  Tried again with a
new, empty project.  Added files but got same error when I attempted to
compile.

(b)  How do I save/use a header file?

         I have some functions.  Wrote and tested them.  Took the function
prototypes and #includes, and made them the header file.  Included it
(#include "html.h") in my file with the main function.  Took the rest ---
the function definitions --- and made them the .cpp file.  Is this the way
you use a header file?

        Where is this documented or described?

Thanks, Alan