A common mistake for young infielders is waiting for the ball to come to them. If it's a hard ground ball, that isn't likely a problem. But it's rare that an infielder doesn't have to move at all. In fact, if it's coming right at them, they should still charge the ball, meaning running forward to grab the ball.
There are really good reasons why. First, the fielder is shortening the distance for the throw. It's a lot easier to make a relay from 100 feet than 120 feet. Secondly, the ball can take crazy hops at any time. The fewer times the ball bounces on the ground, the better chance there is that the ball won't hit a stray pebble and bounce in a strange direction. It's always best to play the ball before it plays you.
