There are three main types of online poker: casino, video, and P2P. With casino and video poker, it’s you versus the casino. The odds are against you and luck plays a big role.  With P2P poker, it’s you versus other players. Poker sites earn their money by taking a share of the pot/buy-in and every player has the same chance of winning. If you play well and have a good strategy, you can win. Luck still plays a part, but if you keep playing well, it should balance out eventually as everyone is on the same level.