If you are betting on blackjack, learn basic strategy because you are going in blind without that. If betting on roulette, understand how the different betting systems in roulette work and bet accordingly. Keep track of time. Casinos purposefully remove clocks and other timekeeping equipment so that people cannot tell the time and will keep playing as long as possible. Try to avoid drinking at the casino as much as possible. The drinks might be free, but it can leave your judgment compromised, leading to significant losses if not careful enough.