[Precision]

OK so after having iphones since 2008 I decided to take the plunge and mix it up a bit. I replaced my iPhone 5 with a Motorola Moto X which is basically a Motorola Ultra or Maxx just a bit smaller and ATT not Verizon.

Now I need help. I can do basic stuff on it but for the most part I'm lost. What are you must know this or change that things about the phone and settings. For example I have no idea how to control what is running in the back ground all the time and don't want to crush data for no reason. Also what ate some security settings I might want so randoms can't creep on my stuff or so my browser's secure etc. Or cook stuff slash must have apps or info for settings. I can't even set a pic I like as a wallpaper... I don't know how. Also what do I do about music? All my stuff is on iTunes or iTunes DVDs... I guess I could just do spotify? Helppp