I believe in you.

I have confidence in you.

You are the person that I confide in.

I am confident that you can do it.

I am confident that we can win the game.

I am confident about the examinations.

I am confident with your abilities.

I am confident in your abilities.

Which are the correct ones?
They are all OK, Michael.
I see.

I am confident in/with your abilities. Which one would you prefer?
Students: We have free audio pronunciation exercises.
I like 'in' better. But actually, I think 'about' is the more common choice.