The most common mistake for a young infielder is not getting down on the ball. Keeping the glove down, then bringing it up if needed at the last second, will position an infielder for an easier and more fluid motion when it's time to throw. And it's a lot easier to bring the glove up toward the body than down toward the ground at the last minute. A good fielder doesn't "stab" at the ball - he or she simply scoops it up. But that takes practice.
To do so, bend over and straddle the spot if possible. It's best not to backhand or field the ball to the side unless absolutely necessary. It's simple enough why: If the ball then doesn't hit the glove, it could hit the fielder's leg or torso or an arm, thereby giving an infielder a fighting chance to still make the play. If the ball is played to the side, it's likely to get through to the outfield if the ball isn't caught cleanly.
Some infielders, especially at second base, where the fielder might have more time, will even kneel in front of the ball so there's no way it can get past them. And an infielder can't be scared that the ball is going to hit them in the face with a tricky hop.
