You chances of winning is usually based on the Return to Player (RTP) percentage of the casino game you are playing. The RTP of an online slot game can be up to around 97% which means that for every $100 bet on that slot, $97 is returned to the player in the form of a win. So the house edge in this case is 3%, or $3. Taking advantage of welcome bonuses and other promotions, as well as having a clear strategy, will help improve your odds.