New to Android, any tips?

I just got a Galaxy S III. I was looking for a good guide, tip, tricks, or suggestions to this phone and Android.
I actually upgraded from iPhone 3GS which was old and iOS was so bland, it kind of a shock moving to an OS that can actually do so much

Also , What is the difference between Touchwiz and CM10?
I mean the settings and notification panel in Touchwiz are nice, While something are poor.