1. Know and read your keys
2. Beware of crossing tight ends (they love to use you as a pick)
3. Step up on passes (to avoid the traffic and to help with LOS issues like screen passes and short kicks
4. Listen to make sure your Referee gets all the information (who, what, when, where) on fouls and relays the
correct enforcement* to you
5. Make sure any holding calls you have are at the point of attack and/or directly impact the play. Calling holding on a 2-yard loss is obviously unnecessary....
*Hopefully, you already understand the all-but-one penalty enforcement principle. If not, get busy!
Good luck!