A common mistake at the net is to hit the ball and remain stationary. At the net you do not have much time, so you need to hit and recover immediately.
A smart way to play the overheads is to hit the deep overheads through the baseline and the short overheads through the sidelines.
When you attack the net with an inside out forehand passing shot you will most likely force the opponent.
When at the net, hit high volleys crosscourt and low volleys down the line to increase your chances of covering the passing shots.
When attacking the net we are normally in an offensive mentality. We move in to finish the point. However, sometime the opponent is able to hit a low shot and put you in a defensive position.
When stretched, a weak crosscourt volley will leave you out of position and will present an easy passing shot opportunity to your opponent.