This document discusses different types and classifications of crimes. It outlines major crimes such as murder, assault, and rape, and minor crimes like public drunkenness and traffic violations. Crimes are also classified into 13 categories including those against national security, public order, and public morals. The document then examines several theories of criminology, such as the classical theory that links low intelligence to criminality, and strain theory where frustration leads people to illegitimate acts.