to stop someone believing something that is not true, or to correct someone by telling them the truth

She thought she wouldn't have to work hard, but we soon put her right on that. 她认为不需要努力工作，但是我们很快就纠正了她这种错误的想法。

to make someone feel better

A good night's sleep will soon put you right. 你好好睡一宿，很快就会恢复的。