Good question, and because you are new to bowhunting nobody should be mad. To start off a arrow/broadhead combo will kill an animal by bleeding it out. A animal needs to loose about 1/3 of its blood before death occurs. Yes the neck has a few blood vessels in it but nothing compared to the chest, heart/lung cavity. Remember too, that with an arrow even if you hit it an animal in the spine, it will not smash it and sometimes will not sever the spinal cord. So a neck shot is very, very bad, and more than likley will not kill the animal for days. Your chances of hitting the main artery in the neck are slim to none. Just a matter of an inch or 2. Whereas, your target area in the chest is 6 inches for a deer up to 8-12 in an elk. Now the chest cavity (because of the numerous blood vessels) can and will kill it within minutes, maybe seconds. Arrows also may kill by puncturing the lungs. If both lungs collapse, the flow of oxygenated blood to the brain is halted, the animal becomes unconscious within seconds and dies before it can bleed to death. I don't know where you are from, but with the information that you don't have I would say that it is essential for you to take a bowhunters education class. Education is the key to successful hunting. And you will definately learn more in one class than we can give you all day long on this board. Depending on what state you are from, it might be mandatory before you can be issued a bowhunting license.