The first step in learning to count cards in rummy is to concentrate on the cards that are most important to your hand and those that could help your opponents. For example, keep track of the cardswazdan slots that have already been discarded that could complete your combinations if you are aiming for a particular run or set. Also, keep an eye on the cards your opponents pick up; this will provide you with hints about their possible hand combinations. Your ability to forecast results and make strategic choices will improve your overall performance in the game as you get better at counting cards.