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.

>>6
Thanks. This df is confusing as fuck, but I think I know what number to read, it's the third number of the first column, right?

I have WindowMaker, didn't see its free space anywhere :(

>>7
But seriously, why does it have to be different? Why can't dir just work like Windows?