Strategy
Consistency || Doubles Strategy

Consistency is about playing within your abilities. Many players try to hit shots that are too good. Aiming at the lines, or trying to thread a winner past a doubles player at the net are two examples of trying to be too good. One of the easiest ways to dramatically improve your consistency, and decrease your error rate is to practice aiming for the "half-of-the-half". This strategy involves dividing the court into two halves:
This technique is also very useful if you are playing poorly. If your strokes are missing by a lot, increase the size of the court by aiming at more realistic targets. Some days you may have to aim every ball right down the middle of the court, other days at the "half ot the half" and other days you may be in the "zone" and able to aim shots directly at the lines with very few misses.
Doubles
Poaching is a doubles strategy that allows the net player on the serving side (ie: the "poacher" in the image below) to take advantage of weak returns. The question is when should you poach? There are several times when poaching is very advantageous and the include:
(1) The returner is hitting weak returns crosscourt.
(2) Every return is being hit crosscourt with few attempts to pass down the line.
(3) The server is missing a lot of first volleys, or is having trouble getting to net.
(4) To pressure the returner to hit a ball down the line if this is not their strength.
The mechanics of poaching are very simple. The poacher cuts in front of the server to hit a the return that is coming back crosscourt. The intention of poaching is to put the ball away. In essence, the poacher is cutting off the crosscourt return before it has time to get back to the server.

Poaching is very useful if the returner is hitting every return crosscourt. By poaching you force the returner to at least think about returning down the line, which they may be uncomforable doing. This can lead to more errors off the return. It also takes some of the pressure off your partner's (ie: the server) first volley.
This video demonstrates a poach. Notice how the net player on the server's side cuts across the court and knocks off a weak return:
