This document provides an overview of basic psychological principles including definitions of psychology, perspectives in psychology like the biological, psychodynamic, behavioral, cognitive, and humanistic approaches. It also discusses Maslow's hierarchy of needs and lists six modern human needs - certainty, variety, significance, love and connection, growth, and contribution. The document defines psychology and explains Maslow's hierarchy pyramid and perspectives in psychology, then provides details on Maslow's hierarchy and a modern list of six human needs.