What were the three types of war crimes?

War crimes are generally categorized into three main types: crimes against humanity, which involve widespread or systematic attacks against civilians; violations of the laws and customs of war, such as killing prisoners of war or using prohibited weapons; and genocide, which is the deliberate intent to destroy, in whole or in part, a national, ethnic, racial, or religious group. These classifications help in holding individuals accountable for atrocities committed during armed conflicts.