I'm still not following sorry?

All builds (except for server/headless build which is Linux only) are available for Linux, macos and Windows as binaries. This includes the standard build and the Mono build. All builds are also capable of loading dynamic libraries at runtime which you can write in C++.

Compiling the whole thing definitely seems onerous but it's surprisingly easy, even for me who barely knows C++. If you're interested you can read about it here: https://docs.godotengine.org/en/stable/development/compiling...

Most people don't compile the engine themselves though, but it's a very viable option if you know how to use a command line.

I think you are misunderstanding. Just go to the webpage, select download, and from the windows tab download the "standard version" and you're good to go.

I don't even see what you mean by it being "a c++ available for linux". You got the same choices for all systems. Just download the editor/engine and start programming. No need to compile anything, except your own scripts/logic if you choose to use a compiled language.