I came to know that a batsman can be stumped out off a wide ball but not off a no-ball (Is it correct?)
What are the possibilities to dismiss batsmen, off a noball, a wide ball, a freehit ball and two or three pitched(dead)ball?
Yes, you are right when you say that a batsman can be stumped off a wide but not off a no-ball.
ICC states that,
So, in such cases the delivery is considered a no-ball and the same rules of a no-ball apply.