Don't start playing for real money until you understand the game rules.
Don't just rely on your luck but on your skill. The rules of the same game in different casinos may slightly differ, so reed them first before placing any bet online.

Don't spend more money that you can afford to loose.
Set the loss limits for a day. If you are familiar with stock market terminology, make a stop loss order. This way you will never loose more than a definite amount of money but you could win as much as possible with the games.

Set time limits when you are playing.
Gambling is very entertaining and you can play 20 hours before discovering it's time to go to work. Ground casinos will never put a clock before your face hoping your 5 minutes turn out into 5 hours.

Don't increase your bets too much when you are winning.
The playing tactics may differ depending your risk tolerance and the game. However, if you win several times it is more likely that later you will hit loosing streaks more often. Be prepared to loose something and don't loose everything in one or two big stakes by doubling or tripling your bets.

Read withdrawal policy of the casino you play.
Don't think you will receive all your big winnings on the next day you break a jackpot. Most casinos set some monthly limits for withdrawals, some casinos won't let you withdraw until you receive a PIN number from them by mail or require numerous pieces of identification be faxed to them. If the rules on withdrawals are not spelled clearly, find another casino.

Have a problem with casino?
Relax. Most problems that are experienced by online casino clients are resolved quickly and usually in the clients favor. Online casinos are a big competitive business and they rely on prompt customer service and retaining customers. If you do not receive the answer to your question or the answer to your claims is unsatisfactory, notify the Online Players Association .

Don't abuse bonus offers.
Don't re-register using another name in order to get the bonus again. The casinos can get pretty hostile over such tricks and some of them can even freeze your accounts and withhold your winnings. Choose casinos with monthly bonuses and players

Bonus wagering.
Remember that before cash out bonus money all casinos require you to play the bonus several times. Some of them want you to play 2 or 3 times the bonus money, others may set 20-times limit and do not count roulette, baccarat etc. bets.

Jackpot hunters' strategy.
Start playing large progressives when the jackpot amount is over an average number or, better, close to the all-time height. E.g. the probability to win Major Millions jackpot is much higher when the pot stands at, say, $1.5 mln...