Tell me all bout the holocaust how did it all start? Why did it happen?

Hitler had his own beliefs and didn't want the Jewish people practicing there own beliefs because he thought it an abomination on his religion. So to keep his people spectated from the Jewish he banned them from going to school and from even going outside. When they started disobeying he decided that apparently staying inside wasn't enough for them so he started killing, making them work at camps and making them be slaves. So millions of people were killed for no reason.