Lag Putt Line Meaning in Golf is the path the ball follows on a long putt toward the hole. It matters because reading the lag putt line ensures proper speed and accuracy. Golfers study slope and grain to plan the line for distance control. A common mistake is misjudging the slope, causing the ball to stop short or roll past. For example, a putt aimed along the correct line avoids unnecessary three-putts. In summary, lag putt lines improve putting distance control and precision.