I've got a few and I imagine some other folks might have some as well. I'll start with one that has been bothering me lately that I hear that I'm having trouble applying to reality.
"Keep the club in front of you" or some variation of this. Hands, clubhead, etc.
Pic of a golfer in top position:
The hands are not in front of the body. The club is not in front of his body. The clubhead is on the actual opposite side of his body. And this is some amateur with an iron. If you look at professionals with a driver, the left arm is practically vertical and the clubhead is behind the back.
And from here - the proper sequence would be lower body, hips, shoulders, etc. Nothing that gets the club in front of the body.
I feel dense right now. What am I missing?