We know there are lots of ways to swing a club but as a golf pro I have always been a fan of a centred swing idea. “Keep your head still” has been a phrase used in golf for many, many years and although it is not strictly correct and also when taken too literally can immobilise the swing, it still gives us the idea that a centred swing has been an effective method for golfers to work towards. (You can still have a centred swing and have head movement).
One of the areas that can be confusing especially in feeling terms when trying to stay centred is weight shift. When focusing on weight transfer during the swing it’s easy to think too much of side to side and therefore can lead to a lot of swaying around. One of the best ways to think of this is that your upper body stays centred (not still) while your lower half feels weight movement. One more point to note on weight transfer is that because the swing is rotational weight also moves thru the feet from toe-to-heel & heel-to-toe as well as left-to-right and right-to-left.
Below are some face-on illustrations showing the ideal weight percentage on each leg during the various stages of the swing. The ideal sensation to look for is feel your upper body staying centred, but your weight shifting in the direction the club is moving.