There are six different positions in hockey. The first and most important position is goaltending. This is the goaltenders position. He stays in front of his own goal protecting it. He stops all the pucks from going in. If a team is losing they might bring the goaltender onto the bench so they can get an extra attacker (this is not a penalty). Another position is defense. This is important because they help the goaltender. There are two of them and their job is to stop any player with the puck. The positions are left defense (left side) and right defense (right side).
There are also two wingers, left wing and right wing. They stay on the side of the ice and they try to get goals (offense). This is very similar to the last position center. The center is the player who takes the face-off. He also is offense and goes in front of the the opposing team's net, screening the goalie (getting in his way so he can't see.) These are all of the positions on the ice.