The document discusses several concepts from social psychology: - First impressions form based on initial interactions and appearances - Stereotypes involve generalizing people into groups based on single attributes - Confirmation bias and the halo effect lead people to seek and favor information that confirms their preexisting beliefs - Optimistic bias involves underestimating the likelihood of negative events - Aggression can include verbal and physical harm toward others - Balance theory suggests people develop relationships to maintain consistent beliefs about themselves and others.