The following tips are meant to not only help you maximize efficiency, but to also make your life a bit easier by not having to think so much.  Most of these tips apply to any of Nikon’s latest cameras, including the D4s, D800, D810/e, & the D750, but it’s focused primarily on the D750 features.  Some features may be in the older models, but these are just the cameras I have used and know for a fact they are implemented in the UI.