Killing X11 in linux

Recently my father in law bought me a Raspberry Pi for my birthday, super sweet!  I've always tooled around with linux, however never got serious about it.  As I started playing with it, I found that using the default OS (the NOOBS) was slowing me down and I just wanted a command line.  I have 2 options at this point

1. SSH
2. Kill window manager, and just get to the command line.

I opted for #2.  However how the hell do you do that without restarting (you know, cause I'm lazy) I figure you start it by saying 'startx' perhaps you kill it by 'stopx'.  No dice.  I went on and tried some other things, none of which worked.  Eventually I consulted my linux friend and he told me to try hitting 'ctrl+alt+F1'  Sure enough, that killed it and there I am on just the command line!

TL;DR:  

startx - starts X11

'ctrl+alt+F1' - kills X11