Psychoanalysis, the most common form of psychotherapy, relates to Freud's theories and studies how unconscious influences affect behavior and mind, often linking to childhood experiences. Humanistic therapy focuses on people's innate goodness and potential, believing problems stem from deviating from a positive path. Behavioral therapy replaces unhealthy behaviors with healthy ones through modification to treat issues like depression and ADHD. Cognitive therapy holds that thoughts dictate moods and focuses on substituting negative thoughts with positive ones before depressive moods occur, commonly for depression treatment.