This document discusses the essentials and stages of crime. It defines the two essential elements of a crime as actus rea, the physical act, and mens rea, the intention or state of mind. It categorizes different types of intention such as intention, recklessness, negligence, and knowledge. It also outlines the different stages of a crime from mere intention, to preparation, attempt, and finally commission. The document provides examples of crimes that fall under each stage. It further categorizes crimes covered by the Indian Penal Code as bodily offenses affecting life, bodily offenses affecting the body, property offenses such as cheating, extortion, miscellaneous, robbery, and breach, and other offenses.