Individual Differences: Individual differences refer to variations or distinctions between individuals in terms of their characteristics such as abilities, attitudes, temperament, or behavior.
Self-concept: Self-concept is an individual's perception or understanding of themselves including beliefs about their personal attributes such as skills, values, roles they play in society.
Nature vs Nurture: Nature vs nurture is a long-standing debate in psychology regarding whether an individual's characteristics are primarily influenced by genetic factors (nature) or environmental factors (nurture).