Basic Hockey Rules

Changing "on the fly" - Players may change at any time during play.

Icing - Shooting the puck down the ice from behind the red line across the opponent’s goal line (results in a stoppage of play, faceoff occurs in defensive zone).

Off-sides - Crossing the blue line into the offensive zone before the puck. If you are already “off-sides” you and all of your teammates must leave the offensive zone before reentering (results in a stoppage of play, faceoff occurs outside of offensive zone).

High Sticking - Raising the stick above the shoulders (results in a minor penalty).

Checking is not allowed in Women’s hockey (results in penalty).
 

More information can be obtained from the USA Hockey Rule Book(pdf) or Hockey 101(Terminology).