You engulf something when you swallow it up and take it over. The tree in the picture has engulfed the fence. You can also engulf yourself in something by becoming completely absorbed in it, for example "he engulfed himself in his new hobby".
Golf is a game where the people who play it try and hit small balls into each hole on a golf course in the smallest of strokes. People who play golf are called golfers, and they try and hit the balls with different size golf clubs, depending on what kind of ground the golf ball is on.