When Jesus was nailed to the cross, did the nails go through his hands or through his wrists? I have heard some people say that the nails went into Jesus's hands and I have also read that in a crucifixion, the nails went into the wrist.

What really happened on the cross?
The word used in the Bible can mean any part of the hand or arm. People who study crucifixion in general found that the nails most often went through the wrist and that the weight of the body would cause the nail to tear through the flesh of the hand as is most commonly depicted in Christian art. Thus, a fairly common view is that the nails actually went through the wrist.

Crucifixion