Toe line
A tip based on golf schools over the last year, proper turn in the backswing. The Peak Performance Golf Swing is a "limited turn" golf swing; that does not mean no turn at all!
I promise you that alignment is the key to successful golf. Without proper alignment, you've already set yourself up to hit a bad shot, even before you take the club back.
I recently returned from another successful group of golf schools. I really enjoy the interaction I have with my students, and this trip had some really terrific people. But, the important thing about these schools is working on improvement.
If you don't know where the butt of your club points throughout your swing, you need to start taking notice. If it's pointing anywhere towards your aiming line, your swing is much too flat and laid off, which means you're probably in the sacred burial ground.