Not everything that you see or learn in magic is going to be used to fool someone. Some things are known as utility moves. Now, the Change-Over Pass, for instance, is one of those moves.
Where I take a coin and I toss it to the left hand. But, what you see as one coin is really two coins. The Change-Over Pass. Not necessarily a magic trick, but a utility move that you're going to have to learn in order to continue on with your coin magic.
You secretly have an extra coin in your left hand. This is the coin that's going to be exchanged for the one in your right hand. But, the audience will only ever really perceive it as one coin.
So, with the coin in the left hand hidden, you're going to show the coin in the right hand. Now, as your right hand turns over, it's going to be flipped at the base of the three fingers in your right hand. Like that.
At the same time, the left hand, which conceals the second coin, is going to turn over, revealing its palm coin. So, essentially, it's a switch. Like I said, not necessarily a magic trick. But, a useful utility.
Now, I told you that the utility pass couldn't be used as a magic trick. Not necessarily true. You could then, after you do the pass of one coin to the other. You could, then, take that coin and turn it into two by splitting them in half.
But, in my opinion and my experience, the Change-Over Pass is best used as a utility and not a magic trick.
But, that's why magic is great because you get to be as creative as you want as magicians.
Enjoy the Change-Over Pass.