Information about the holocaust

Lets see what do i know about the holocaust.........
I know that the holocaust was a mass killing of jew in concentration camps that was set up by the nazis.
I have also read a book that was similar to the diary of anne frank and talked about how they were always in fear of being taken away next and seperated from their family.
Once i saw a movie with my family called It's a Beautiful Life.
The movie is about how a man and his fathers resteraunt have to suffer because of being jews often with grafitti or being assaulted by nazis. Eventually the man gets married and one day he and his son are taken to a concentration camp. The father risks his life many times to make his son happy and try to keep him safe all the while he has no idea what is going on and if he will ever see home again.
I think that the holocaust was a tragic event that should have been prevented. It changed the lives of many people, tearing families apart, ruining businesses, and killing thousands of jews.