Each VP variety and paytable has its own strategy. The strategy for Jacks or Better is different from that for Deuces Wild, and within each style of machine, each paytable can have its own strategy. Learning all those strategies is tedious, so I recommend you figure out which video poker game you like best, and then learn the strategy for it. If you get bored with that game then you can learn another strategy at that time. For now, let's start out with an lesson on Full-Pay Jacks or Better. I chose this game because:
Elsewhere on this site I show you how to figure your average loss for an hour of play. In summary, you multiply the house edge by the bet size by the number of rounds per hour. On a 9/6 quarter Jacks or Better machine with proper strategy, that would be 0.5% x $1.25 (remember we're playing 5 coins at a time) x 400 hands per hour = $2.50 per hour. Not bad. Except that the formula doesn't work for video poker in the short term. That's because you'll hit the royal only once every 66 hours on average, and while you're waiting for the royal, the return on the game isn't ~99.5%, it's ~97.5%. So you're more likely to lose 2.5% in the short term rather than 0.5%. So we can expect our hourly loss to be closer to $6.25/hour than $1.25/hour while we're waiting for the royal. Still, $6.25/hour is pretty cheap. On a slot machine your loss would be closer to $40 an hour. So you can see why I'm so eager to switch you from slots to VP.
Pick a game. There are dozens of different video-poker games in casinos. Different games will have different rate of returns, meaning some games, if you win, will give you a higher percentage of your money back and others will give you a lower percentage. A "9/6 Jacks or Better" paytable is the best because the rate of return is 99.54%, meaning the casino only keeps .46% of your money.
Despite the importance of finding the best machines, most players don't. That's why casinos can offer both decent and lousy machines in the same casino and be confident that gamers will still play the lousy ones. They have to keep some good machines, otherwise they'd lose all the players who know what they're doing. But most of the machines will be bad, and most gamers will play them anyway. Heck, in Vegas even casinos and supermarkets have video poker, with absolutely terrible paytables, but people will still play them rather than going across the street to a casino where they can get seven times better odds. Go figure.