This journal entry discusses the key concepts of self-concept, self-serving bias, and self-efficacy that the author learned about from lectures. For self-concept, the author notes how one's sense of self is shaped by daily life experiences and differs between individualistic Western cultures and more collectivist Eastern cultures. For self-serving bias, the author explains how people tend to accept success but defend failure by blaming external factors. For self-efficacy, having a belief in one's abilities to complete tasks is important, as losing confidence can cause giving up. The author found learning about these psychological concepts useful for gaining self-knowledge to lead healthy, successful lives.