Telling how much space left in linux

On windows, I can easily know how much space is left on disk with DIR. But on this linux, ls doesn't show it. How do I tell?

What in the fuck. So I want to know a simple thing like the space left in my fucking drive and I have to read man pages for sudo and lynx and use complicated commands like these? You must be kidding me. This is going worse than I thought, Linux is still years behind Windows in ease of use.