Preparing for every shot is one of the most common differences between Tour Players and amateurs, not thinking through every aspect of your shot prior to hitting it will lead to more mistakes and the common occurrence that the second shot you hit is always better
Your sand wedge is not always the correct club to use in a greenside bunker, always test out the weight and depth of the sand, you might need more loft or less bounce depending on the specific course conditions
When you set up to putt pay attention to what your head and eyes do when they check the target, players who line their putts up right or left will have their head and eyes move towards their left shoulder or up to the sky rather than directly down the target line