This technical report discusses building self-confidence. It defines self-confidence as being secure in one's decisions and actions and free from doubts. It states that self-confidence comes from self-efficacy and self-esteem. It identifies some potential causes for lack of self-confidence, such as negative life experiences, failures, self-criticism, and fear of failure. Finally, it provides tips for boosting self-confidence, such as learning from mistakes, choosing friends carefully, thinking positively, and staying active.