Try not to overpush unless in late position and only one/two people are in the pot AND at most two will call, preferably one. Start building the pot PF with a raise, and continue on the flop. Keep building it to the river, call a push on a safe flop, or pre, but don't push yourself until its safe to do so on the river, when your pretty sure your ahead.

It is not hard at all early on at a loose table to get it all in anyway without pushing pre. Ex.

Early blind level. AA. Lets assume you have 1500 chips, a few rounds of blinds does not matter much anyhow.

Raise pre to 200 (overraise), you get 3 callers (not uncommon early in a freeroll). Pot is now 800 at least. Flop you bet 350. Get 2 callers and a fold. Pot is now 1850 at least (you have only risked 550 of your own chips and the pot is huge!). Turn comes. Time to decide, are you willing to go to SD or is the board too scary, after the next bet you are commited. When I decide at this point, if two are still in the hand, while I expect one to fold, I am deciding assuming both of the others are going to be going to showdown as well. If there is a draw on the board at this point and going to go or if I want to try to get it down to one instead, I will shove at this point, to try to get anyone on a draw out now, if it appears on the river, its too late to fold anyway. If it is a safe board, and it seems safe enough to not worry about both staying in I will bet around 600 (leaving me roughly 300-350 chips). On the river, I shove no matter what happens as I am not putting ~75% of my stack into a pot then folding.

Now at a minimum I am getting 800-1500 pot, if I get some callers and they all fold on the flop or turn, at a 200-550 risk of my chips. Terrible flop/turn and have to fold? Oh well, too bad, but at least I only lost 200-550 instead of my stack.

Early on many will call your shoves, AA vs 1 person is ~80% to win, against a full table it goes down to ~31% to win. As you see, the more that is in the hand, the chances of you coming out the winner just keeps going down. By pushing pre, anyone that calls cannot get out, neither can you. Some are just outright donks, some are trying to double up or more by getting lucky or busting out fast. People will drop out after your PF raise, then more as your building the pot on SAFE boards. Your odds of improving are ~7:1 unless you get a 4 card board straight or flush. So you get rid of people as your building the pot, and usually by the river at early stages the second best hands are pot committed and are not folding. Many times I can still get more than doubled up, with only one person left at the showdown, at a smaller risk to myself. Only good strong hands early on, dont push, but call pushes with AA-QQ/AKs. Possibly AQ if it is someone that is pushing a lot. (use tools if able to identify who is playing a lot of hands, and/or raising alot of hands and your sure to be ahead of them even with AJ if you wanted to risk it.) AA, you raise PF, flop comes suited… toss it unless you have a flush draw as well (and use correct odds to call a bet.) By pushing pre with very strong hands your very likely to be ahead, or at worse a slight dog the majority of the time, but by doing so, you are gambling just like they are. It is going to showdown, and your forced to have the best hand. Your not leaving yourself a way out either, even when it would be apparent you got behind if played normally.

Pick the players that are playing a lot of hands to try to get into hands with. They are willing to donate chips all day long.

Later on start to loosen up a little bit, most of the gambling types are out, and the few left are either short stacked, or have a big stack. I prefer them to have large stacks. I use them to double up on, and again, and again as many times as I can. I play smart, they play lucky. Unless they get lucky, I get doubled up or at least a nice pot usually, and if I can tell they got lucky, then I get out and pick another spot.

Its hard to believe, but some of the people will notice your playing tight and will be very wary of you, thats how being aggressive will help get those people out, even if you don't have the best hand. There is two types of aggression, one is smart, one is stupid. If there is multiple people in the pot, your not bluffing your way through, don't bother. If you raise PF with a good hand, and you get one caller, bet ~1/2 the pot, your liable to get the pot on the flop. If there are 3, save your chips, your going to have to improve, everyone is not going to fold. If someone is calling all the time and is in the hand, don't bet unless you are sure you have them beat. (again tools help ID these people without you having to bother trying to remember them on your own)

Do not worry about how big your stack is compared to others. Most freerolls have large fields, getting to the final table of large fields is not going to happen all the time. When you are really short stacked, you have to make your moves. If your short because of not getting hands, its not hard to build your stack without ever seeing a flop if there is not a maniac calling everything at your table. Push, all but one is going to respect your push, and if you have just folded 20 hands or more in a row, even most donks realize you have not played, and will bow out of the hand. One time I went 45 hands, 45 hands of pure trash folded. My M was ~4, the antes had just kicked in, I pushed 5 times in a row (more than 3 is pushing it) with whatever I had and got the blinds/antes and was back to a ok size stack. The first time, people think ok he has a big hand, another soon/right after, ok maybe he has a good one again, after a few more close together then they catch on so be a bit more careful. While doing this, try to be in late position, middle at earliest, and one of the most important things about it, is be the very first one into the pot (I will fold A3 to a limp (from a tight player) or raise one hand, and the very next push with 10/4o, be the first one to put money into the pot except for the blinds when pushing with weak hands while short stacked and trying to steal). A loose limper you might not get called but I am very careful of trying unless they are the loose limper that consistently folds to a raise (in that case I am going to do it all day long to them, especially if they raise a lot then fold to a reraise), but someone raises, you really need a good read, and know for sure they are a person that can fold to a reraise if they are not a loose player. Sometimes your cards do not matter at all. Except with very strong hands like AA, do not push, put in 1/2-3/4 of your stack, then the rest on the flop to try to get a caller rather than hope they fold. A good thing that almost always happens if you wind up building up your stack this way, is if you have gone that long without any playable hands, is shortly after going hyper aggro to steal, you will get a good hand, then your not beleivable and you get action on a good hand when you want it.

Do not play too many hands. Get chips, keep them, and add to your stack. Have only 3 buttons you use, fold, bet, and raise. If you cant bet or raise, your hand is not strong enough to be calling. The only exceptions,

A. when you have a monster like flopping a boat, nut flush or so forth. If there is a aggresive player behind, I will check, and call and lay the hammer down on them on the turn or the river.

B. You are on a draw. Know your odds for making your draw, and make sure your pot/implied odds are correct to call. Sometimes to mix it up, I will bet to either try to take the pot down right there, or to try to disguise I am on the draw if they call so if it hits on the turn I can either check to make it look like I am worried, or I can bet to make it seem I was not on the draw and still betting whatever I was betting on the flop, or I can check to make it seem I am worried they have the flush and so forth. Sometimes I will raise, or check raise (not often on a draw though) to try to get the pot right there as well.

Identify the players you want to exploit, find the ones you want to try to avoid. Find spots where you can make a move, and its likely to work (especially short stacked), and do not use the call button much at all. Smart aggression is your friend, stupid aggression and the call button is you being the donk someone is looking to exploit.
References :

But until then, the #1 peice of advice for any beginner, is starting hand selection. Play only premium hands and it will take you a long way towards winning. Patience is required as you have to wait for these hands, but they will come.

Raise and Re-Raise with AA KK QQ JJ 1010 AKs AK

Call up to 4 blinds with AQs AJs AQ

Raise with KQs, but don't call with it. (unless multi way pot and you can fold a pair of kings or queens if people are betting. You have to play it like a suited connector, not high cards.

Call up to 4 blinds with any pair. If you don't hit 3 of a kind on the flop, be ready to fold.

Fold suited connectors when you are first or second to act, but play them when closer to the dealer button.

Just follow that basic (very basic!) strategy until you learn more and you will be better than 50% of the competition.

The real strength of playing only good hands before the flop is that it makes your decisions *after* the flop much easier. As you get more experience, you can loosen up a little bit and start playing other hands when the situation give you an opporutunity.

The only other big piece of advice I can give is don't lose a big pot with top pair. If you have AK and a K comes on the flop, generally people will figure out that you have the K. When someone knows what you have, and you don't know what they have, you are either going to win a small pot or lose a big one. Be very careful if you have top pair, bet, and get called or raised. Think about what hand they have, not what you have.

Good luck!
References :

If you've been struggling with your online tournament form recently, then freerolls could be your next port of call. Almost all poker rooms offer some kind of free to enter tournament, with real cash prizes.
References :
http://pokerworks.com/article-265.html

Here is the following strategy I suggest you use:

DISCIPLINE

Without discipline you'll become easy prey at the tables. Part of your texas holdem strategy should be mucking trash hands before the flop. Too many players are willing "to pay to see the flop." They get involved in hands they had absolutely no business playing.

Texas Holdem Poker Strategy #1:Learn the "art of the fold." Fold TRASH hands pre-flop.
ATTITUDE

Napoleon Hill said, "If you think you are beaten, you are. If you think you dare not, don't. If you like to win, but you think you can't, it is almost certain you won't."

Texas Holdem Poker Strategy #2:Have a positive attitude. Focus on winning.
PATIENCE

Annie Duke said, "Good poker players are boring poker players." Televised poker has spoiled us. TV makes us think we've got to always be a part of the action. What TV doesn't show is the countless hands that Daniel Negreanu or Gus Hansen folded.

You might be at a table folding your first 15-30 hands. Boring! Don't get impatient just to get some action.

Texas Holdem Poker Strategy #3:.If you are patient, the good cards WILL come!

"The two most powerful warriors are patience and time."
References :
http://www.learntowinholdem.com/