Poker can be a hard game to master but don't think that if you win a couple games that you are god's gift to the game. Keep your ego in check. Which means don't get too cocky. Remember, 'pride goeth before the fall'.
Keep the right mindset when playing. This also means don't get too emotional. Yes, you are going to lose some of the time but suck it up. Not only is being overly emotional unsportsman-like, it will usually leads to you making bad judgements at the table
You've got a great hand...now what? First, don't get too excited and scare off the other players. What good is your hand full of aces if everyone folds on you right away. Don't scare them off, ok? What I mean by that is don't suddenly 'bet the farm'. Take it easy. Maybe just limp in by simply calling whatever meager bet the others are making or you could even just check if that's what everybody else is doing. Once you got them where you want them -putting money in the pot- its time to Strike! Start upping your bets, the sky's the limit. Hey, how often do you get a great hand like that. So go for it. Hopefully someone will raise your bet and then you can re-raise to get more moola out of them. All this big betting might make all the other players fold, but hey by this point you did manage to get a good chunk of change in the pot, so its all good.
Or, if one of more players are still in the game, you've got a good chance of taking it all.
Playing poker online can be won by you, now. There are numerous sites out there that are free and fun, and most importantly, will allow you to hone your skills. They will also most likely have "Training Tables" and links where you can learn the rules of the game, if need be.
Personally, I like playing Limit Texas Hold 'Em. After utilising the training tables and feeling comfortable that you kinda know what you're doing, find a game table with not too many other players. This is because the more competition you have, the more chance there is that one of them will be able to beat you! Sometimes I'll hold back a bit before joining in to see how the others' style of play is. Are they big betters or timid? Keeping this in mind, its time to jump in