Newbie question

[Northern Goat]

But I have to ask.

How do some guys drop the front end of their car so the top of the wheel well is flush with the top of the wheel and still maintain any sort of turning radius?

My next project is going to have coil overs and I would like to get the car as low as possible, but still driveable? I'm sure this will effect the backspacing on the wheels I choose also.