Bartenders

The first bartender duty is a social one. A bartender is responsible for serving their customers at the bar. That breaks down into two pieces: flexibility and recommendations. 

The mixing and combining of ingredients—alcoholic and not—is the big kahuna of bartender duties. There are two levels to this. The first is knowing all the classic cocktails. The second is being familiar with the basic ingredients to experiment with them and make original cocktails. You should also know how to pour a beer, but that seems less impressive to customers. Depending on your state, you may also need to attend alcohol server training.