Why do casinos offer games that can be beaten? Because only a very small percentage of players know the basics of proper play. Enough mistakes are made that the casinos actually pay out 2 to 4 percent less than the expectation for skilled players. In competitive markets, casinos walk a tightrope between two choices -- offering a pay table so good that the best players can expect to make a profit in the long term, or offering lower pay tables and risk driving away the weaker players who are the casino's bread-and-butter customers. In less-competitive markets, where the demand for space to play is great, casinos will offer lower-paying machines because they will be played despite the low payoffs.
The game that you should learn first is Jacks or Better. Most of the other games are variations of this one. Although space does not allow me to give you the complete strategy in this article, you can find free strategy charts at The Wizard of Odds for Jacks or Better, Deuces Wild, Double Bonus Poker, and more. Sites like Video Poker Trainer allow you to practice playing online and will correct you when you deviate from the optimal strategy.
An inside straight is a would-be straight with a hole in the middle. 9? 2? 10? 8? 6? is an inside straight because only a 7 will turn it into a straight. The distinction between outside straights and inside straights is important because in Jacks or Better we will never try to turn an inside straight into a straight. It's too hard, since we have only one chance of completing the straight.
You will also learn the layout and importance of the pay table, as well as how to properly bet while playing video poker. You will learn and understand payback, return, house (and player) edge. You will learn about the implications of variance, sometimes called volatility. You will also learn what the term random really means when playing video poker.