Good morning, areev.
(1) This word means lots of different things.
(a) A good dictionary could really give you some helpful examples.
(2) I personally use it usually only in two cases:
(i) Have you ever visited Paris? That is, have you visited Paris AT LEAST one time in your life?
(i) I'm sorry. I will not ever do that again. That is, I promise that I will not do that again EVEN one more time.
(c) There are other uses that I don't understand well, so I will let others explain them.
(3) It might be helpful to remember that "never" = not + ever:
(a) Have you EVER been to Paris? No, I have NEVER been there./ No, I haveN"T EVER been there.
Have a nice day!