I don't like the centralization around a proprietary software, but saying GitHub is a random site isn't fair. A lot of F/OSS people use it. Out of curiosity what happens when you want to submit say a picture to a repo?

I'm not a graphic designer, so I don't usually do that, but I'd probably email the author or development list. Projects with lots of binary files checked into version control are very different from source code, though, so I don't know how they normally operate.

Why would you recommend a apple only service?

Because neon_electro is a satisfied customer?

Debian stable is a very very stable distribution, as such packages can be extremely outdated. He could compile or get it another way but that can be annoying.

Why wouldn't you just use c++ then? Almost all c++ is valid C, no?

A lot of people write C in C++ mode just for convenience, you get things like const, but it's not the same as writing actual standards compliant C code.

If you need portable C code, forget about all that stuff. Forget about a lot of things since some compilers are truly atrocious.

Almost all C is valid C++, but the reverse isn't true.

Almost but not all. Restrict keyword, by example.

Also modern features like atomics and complex numbers are implemented as language features in C, but with template libraries in C++. Likewise type-generic math in C11 uses the C-specific _Generic keyword, but uses templates and function overloading in C++