Explanation: A person's self-confidence first comes from his self-knowledge, knowing what he can do within his ability and choosing what to do according to his ability. In this way, self-confidence is cultivated in a high success rate. Confidence is also a kind of courage. Self-confidence comes from self-knowledge and explanation.

A person who knows little becomes ignorant and naive. Such people dare to think and do. I don't know the seriousness of the consequences of the mistake, so I don't care about the consequences. This is fearless. -Ignorance makes you fearless to explain