And walk, don't run. Running around is annoying, distracting and causes damage to the course. So, as a novice, be reasonable with the number of practice swings you take. One or two should be enough. And if you notice that the group behind you is waiting for you to finish, you might want to wave them through.
Bunkers are sand traps.
When entering a bunker, always enter on the low side. After hitting out of the trap, cross-rake the sand both where you hit the ball and your footprints. Some of your swings will result in lifting a chunk of turf. If your shot causes a divot to be dislodged, walk over, pick it up and put it back. Be careful not to leave your shadow over the hole.