Making the switch from iPhone to android, just got a new Galaxy S6 64gb(non edge).

I'm sure theres a million awesome things i can do.
and oh how ill hear all about how apple sucks etc, don't care

what i wanna know is from android users, whats good apps to get? whats Key things i wanna know/do with this phone.
i will be putting all my currently used apps onto this one since theres 90% of them have a iPhone/android alternative.