When playing a FW with side-slope 2 situations occure:
1st: Play the ball into the slope so it has a better chance not to bounce off the FW:
2nd: When playing the Ball out of a sidehill lay the ball tends to fly away from the hill. Therefore aim to the "hillside" of the Target. Rem: In Realgolf sidehill layes up to about 5° are better compensated by gripping the club shorter (when standing below the ball) and longer when standing above it.