This is to travel a greater distance sideways at the net. To move left, take a step with your left foot, then cross your right foot over in front of your body (your body is now sideways).
Keys to blocking in volleyball are positioning, timing and movement. To be an effective blocker you need to stay in a balance position ready to anticipate.
Good blocking skills consist of moving into good position to jump up and penetrate the net with your hands and arms to deflect or block your opponents attack.
Ready position for blocking