When chipping off a downhill lie, the most important tip is to level your shoulders to the slope of the ground so that your club makes contact at the ball
Think of your body as door hinges and your arms extended out as the door, when the door opens there is no roll in your arms, the toe of the club starts pointed up and goes back and through the same way, this is how your backswing should function
Practice this hitting under a rope drill to help keep your hands forward at impact and avoid an early release of the clubhead