When playing golf, the ball hits the green and is used to mark the position of the ball. At this time, you take off the cap clip, mark the position of the ball, and take the ball away, so that your golfing partner, It won't touch your ball when you putt. When it's time for you to putt, you need to put the ball back in place and putt into the hole. This is the most basic etiquette in golf. Unmarking the ball is not a foul without the balls colliding, but it shows disrespect to your partner.