One common mistake many players make is they ignore the slope of the grass they are standing on and are frustrated at the behavior of the ball when they strike it.

They expect the ball to do something other then what it will.

Don't be surprised on uphill or downhill shots.

On uphill shots, you can expect the ball to fly high and even draw to the left a bit. Make sure you aim accordingly. If you have a small slice expect the uphill lie to add a bit of correction.

For longer clubs, make the following correction. Play the ball more forward in your stance than you normally would. You will feel like you are leaning back a bit and that's ok. Then sweep the ball and expect it to have a high trajectory (and go left a bit).

For shorter clubs, play the ball more forward in your stance AND lean into the slope. Plan on keeping your weight on your left foot through the whole swing.

Instead of a sweep, punch the ball and don't expect it to draw left.  It should go the direction you aim.

Source: Free Golf Tip Newsletter Number 33 of 52