Kids love watching the ball once they hit it but that will destroy a putting stroke, so use this drill to keep their heads down
There are two types of players, those that putt on a path versus those that putt on a line, the path putter work more on feel and seeing a wide path to the hole while line putters are very specific, need a line on their putter head, and see a think line directly from their ball to the hole
It is much easier to aim at a target that is closer to you than one farther away, so pick an intermediate target a foot or two away from your ball and square your putter up to that spot and use the hole for distance control purposes