Hitting the ball with the bottom of the club face can result from several different swing faults
Depending on whether you are a hooker or slicer, making a minor adjustment to your setup and having a plan before you hit the course is key
Focus on your left wrist at the top of the backswing and start of the downswing to get to impact properly, many players have a cupped left wrist which changes the angle of the clubface, this causes an open clubface and results in casting and manipulation during the last portion of the downswing