Here are some examples of how to use it:
* Elle est fière de son travail. (She is proud of her work.)
* Je suis fier de toi. (I am proud of you.)
* Il est fier de ses origines. (He is proud of his origins.)
It's important to note that "fier" can also mean "strong" or "brave". The context will usually make it clear which meaning is intended.