1. The more you know about a particular course, your true opponent the better chance of making correct offensive and defensive moves, minimising mistakes and thus winning. 2. Jack Nicklaus carries a memo pad to jot down important notes. To use in tournament he marks circled areas to show the best areas to land tee shots, darkened areas to designate dangerous hazards to the side of the fairway or green. Tiny x to mark slopes in the green. 3. He takes notes what greens were slower or quicker. What bunkers had more or less sand in them, contours and firmness of the fairways. Severity of rough. 4. Marks down what clubs to hit off tee and into green in different conditions and winds.