Learned some basic greetings today, now it's just memorizing them, Guten Morgen, Guten Tag, and Guten Abend are pretty easy to memorize. But there are others used in southern Germany, Austria, and Switzerland that I'm not sure how much I need to know them, but I'll probably memorize them too. The ones for saying goodbye are going to be a little harder to memorize (besides Gut Nacht, and Tschüss).