Self-confidence is to be sure of oneself and one's abilities.

自信就是肯定自己以及自己的能力。

youdao

Self-confidence is to be sure of oneself and ones abilities. It is extremely important for all to be self-confident as it is the indispensable condition to their success.

自信自信就是要相信自己和自己的能力，对于所有的人，自信都是极其重要的，因为它是获得成功必不可少的条件。

youdao

First, you need to be sure of oneself, think that what thing self does being able to make it, only when the cognition arrives at the effort passing self, self definitely can achieve self's aim.

首先，你要有自信心，认为自己干什么事情都能行，只有认识到通过自己的努力，自己一定能达到目标的。

youdao