1. Psychologists work in three main categories: teaching and research at universities; providing health or mental services; and conducting research or applying findings in non-academic settings.
2. There are two main types of psychological research: basic research aims to increase knowledge for its own sake, while applied research studies issues with direct practical significance or applies findings.
3. Psychologists practice in various settings like hospitals, schools, and private practice to understand and improve physical and mental health. Their credentials and training vary depending on their specific role, such as psychotherapist, clinical psychologist, psychoanalyst, or psychiatrist.