hitting directionals is a very good strategy against casual players, because most people can't hit properly when they have to move to the ball. if that is too much thinking, then just hit cross-court 4 out of 5 times.
coming in 1 out of every 4-5 points after a decent approach shot is enough to really mess with people. many players get flustered when their opponent is at the net and end up making risky shots.
Disclaimer: I'm NOT a coach...
Real tennis: https://www.youtube.com/watch?v=yDqnkLJ9BtM