Dude, there are SOOOO many different versions. 5-card draw or stud, 7 card stud, 7stud hi/lo, texas hold 'em, omaha, omaha hi/lo, razz (stud lo), chinese poker, lowball... there's soooo many versions of the game and some can get real complicated.
MOST poker games are where no matter how many cards you are given, you are only going to play 5 of the cards to make your best 5 card hand. For example with texas hold 'em and 7 stud, you are given 7 cards total, but you are using any 5 of them to play your best 5 card hand. If you go on to any online poker site, you can play a whole bunch of the games for free. Pokerstars.com is the one I play on and in my opinion the best one out there because there are so many games going.
Matty did sum it up great, but also keep in mind that there are heaps of sites around where you can play the games for free, for money and learn how to play them all.
Have a look around to see what suits you, I love playing at pkr myself and they have awesome graphics. For a big list of sites click the link in my source, that's how i got on to it all.
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