main.c vs project.c
 

When creating a new project that is only one '.c' file,

Should it be named:

project.c

or

main.c

?

Please advise

It doesn't matter what the filename is. You only need to make sure the main() function is declared in one of your project files. Which file and what filename is compltely arbitrary.

Still need an answer
 

I know that both would work, I'm trying to establish what the standard is?

For configuration management purposes, and traditional c practices, should the main function be house in

main.c

or

project.c

?

Or is it still a matter of preferance?

Please advise.

Name it with the name of your program. (eg MyApplication.c)

There's no standard, it's just a matter of preference.

Preference, but in most cases program name is used.

There is no standard, but using the same name as the program name has an advantage: you can compile your very simple project with the make command without having to write a Makefile. For example, if you saved the "hello world" program as hello.c:
This simply does gcc -o hello hello.c