Following on from the lists above let's take a look at the reasoning behind each of the points. First the do's. The first two points cover learning the best pay table variations for your favorite games and finding them. By playing the best variations you give yourself a good starting point even before you make your first bet. Of course to get the most out of the good pay tables you need to play max coins on every hand and play with perfect strategy.
Despite the importance of finding the best machines, most players don't. That's why casinos can offer both decent and lousy machines in the same casino and be confident that gamers will still play the lousy ones. They have to keep some good machines, otherwise they'd lose all the players who know what they're doing. But most of the machines will be bad, and most gamers will play them anyway. Heck, in Vegas even casinos and supermarkets have video poker, with absolutely terrible paytables, but people will still play them rather than going across the street to a casino where they can get seven times better odds. Go figure.