The Princess Card Trick
The magician shows a small fan of cards and asks the spectator(s) to remember any one of them. He places the cards in his/her pocket and removes four. The card that is missing, that is still in his/her pocket, is the spectators’s card.
You can also view this trick on YouTube at https://youtu.be/5xtBHoKFhF4
You can see all the previous magic lessons here.