Getting quotation marks to the bottom of a line
On my (german) mac keyboard 


I get „ when i press ALT + SHIFT + w 
I get ” when I press ALT + SHIFT + 2
and I get “ when I press ALT + 2


On your keyboard this can be different depending depending on the language and/or setup. Another option I recently saw here could be as follows:


get „ when you press ALT + . 
get “ when you press ALT + [ 


In order to find the right key combination it can be useful to turn on the keyboard viewer from "preferences > languages and text > input sources ..."  as described here.