This forum is full of tips. You can just check every thread in this section and you will probably find what you want.
But - dont get bored,frustrated,upset and such. Accept the fact that this game has a lot to do with luck, not only with skills, so dont put it on your mind when you lose a hand. Play aggressive, by doing that you will be both building pot and protecting your hands. Be patient. Gather as much information as you can about your opponents. Play in position - that doesnt mean only on the button, you can play in any position BUT make sure you got position on your opponent. Play only strong hands on slow tournaments, loosen up on the bubble and such. Most of that comes with practice.