This document provides an overview of criminal law concepts and various types of offenses. It discusses the elements required for a crime, including mental state and conduct. It categorizes offenses from minor infractions to misdemeanors to felonies. Various criminal acts are also outlined such as theft, assault, rape, homicide, drug and alcohol crimes. The document notes that law enforcement officers have discretion in enforcing laws and most law enforcement is done at the local level by city police and sheriffs rather than federal agencies.