What safety precautions should be taken when rappelling down a cliff?

When rappelling down a cliff, it is important to wear a helmet, harness, and proper footwear. Check all equipment for wear and tear before starting. Always double-check your knots and anchor points. Communicate clearly with your partner and establish a backup system. Descend slowly and carefully, maintaining three points of contact at all times. Be aware of your surroundings and potential hazards.