If you say that someone is exploiting you, you think that they are treating you unfairly by using your work or ideas and giving you very little in return.

If you say that someone is exploiting a situation, you disapprove of them because they are using it to gain an advantage for themselves, rather than trying to help other people or do what is right.

If you exploit something, you use it well, and achieve something or gain an advantage from it.

To exploit resources or raw materials means to develop them and use them for industry or commercial activities.

If you refer to someone's exploits, you mean the brave, interesting, or amusing things that they have done.