It's easy to get very confused with what is taught in the golf swing.
I find this is the best way to consider the arms and wrists. The arms and wrists should be lifted up and down only in the swing, they are not pulled around your body. The around part of the swing is made by the torso and shoulders rotating.
This video by Danny Maud covers some basic essential swing moves but #4 explains the way to use the arms and wrists correctly and simplifies the concept.