Lefties the golf ball is quite a fundamental part of getting a good setup to produce a good shot. I see an awful lot of left handed golfers, as they're addressing the golf ball in that setup position, they're taking a lot of care over some of the fundamentals, but they're actually in building and mistaking their swing to start, because they're not getting the alignment right.
Left Handed Golf Tip: Use Intermediate Spot For Better Allignment (Video)