I would like to add on LOOM his request if it is possible to make a "Hello World" example how make a real Macintosh application of a piece of example C code (like Hello World). This would make it also possible for less talented programmers or starters to develop a classic Macintosh app.

Compilation in gcc is doable for most of us, but how to run it on your Macintosh?

What to do with ResEdit for example?