I do not believe you can have too much information, especially on the golf course. I try to make every course a "home course" and use this to my advantage.
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As far as a weekend player is concerned I think it is wise to know the "safe spot" on every approach, even if it is not on the green. Laying up or even knocking it over may not be a bad play, especially if that is the safe spot.
It is no exaggeration to say that the average PGA TOUR player knows the golf course he's just played for only one week better than the average member who has played the same course for ten years.
These guys are good, and their golf playing skills go far beyond merely swinging the club.