According to my opinion, your biggest teacher is your last mistake, if a person does not learn from his mistake he cannot become successful in life, so for successful life a Businessman always learn from his mistakes.As a young business person, u tend to fail maybe more than once. The idea is not to be overwhelmed by your failures and let the accumulation of unfavorable circumstances affect your mental health. The distinguishing factor between successful business men and others is that they learn from their past mistakes and move forward. They are eager for progress. They don't dwell on failures, curse their bad luck or blame the government always. If the path to the goal is blocked, they search for other ways . Or even build a different and more accessible way.