Rule #1
Treat all guns as if they are loaded.
Unloaded guns cause the more accidents than loaded ones. Always treat all guns as if they are loaded.
Rule # 2
Never let the muzzle of a gun point at anything you do not want to destroy or kill.
This rule is especially important for those supervising novice shooters. When a child holds a rifle for example, if he hears a noise to the side, and turns his head, the weapon tends to follow. Similarly, if you make a great shot, and look back to brag to your friends, don't let the weapon follow your gaze.
Rule # 3
Keep your finger straight and off the trigger.
At all times you must keep your trigger finger straight, and off the trigger. Only once you have aimed and have your target in the sights should you permit your finger to gently rest on the trigger. This prevents accidental discharges should you stumble, trip, or be subjected to some unexpected event.
Rule # 4
Be absolutely sure of your target, and what is behind it.
Hitting a target even under the best conditions is a very challenging thing. If TV and movies were real, the good guys would kill far more innocent bystanders than bad guys. Bullets tends to miss, ricochet, penetrate through, and fall from the sky at velocities just as deadly as when the bullet left the barrel. If your bullet misses that deer or shoots over the top of that hill, you can't bring it back.
Dead is a forever deal. Once a bullet leaves the muzzle, you can't bring it back. You must read, and follow these rules ALWAYS!