Ask hockey fans the primary job of a hockey Official and the answer will probably be, "Call penalties, offsides, and icings." However, the skills required to successfully officiate hockey go deeper and are more detailed than just making the call.
In How to Referee Hockey: it is not just about the Rule Book, you will learn how to use positioning to stay out of the way and to see the play, procedures to work with your colleagues and manage stoppages, and game management to reduce the risk of incidents and respond when they do occur.