I. No matter who you are facing in the game, pool is not you versus that person. It is you and that person versus the laws of physics. The player that takes the lesser beating is declared the winner.
II. The laws of physics are cruel.
III. Don't blame the tools. The table is not perfectly flat, the balls are not perfectly round, and the cue is not perfectly straight, and everyone who plays the game has to face up to that.
IV. Playing for position is an exercise in futility if you miss the shot.
V. Fancy trick shots mean nothing if you can't master the basics.
VI. When you make a lucky shot that you shouldn't have made, don't take credit for it, because then you can't blame bad luck for the shots you miss.
VII. Stroke, don't poke.
VII. Always follow through.
VIII. If you think that being an expert pool player makes you a very big deal, go humble yourself by trying a game of three-rail billiards.