what Draza said
also review your own hand histories
see where you are losing most of your chips, and why (eg. overplaying ak,low pps...)
Frankly, this is not great advice. In order to improve, you have to modify how you think, analyze and play. If you don't look around to see how other players who are better than you do all three of these things, you may still improve, but your rate of improvement is basically certain to be slower than it could be, quite possibly a lot slower.The better way to learn play poker is just play... Just play and read a lot, and u gonna be a good player
Start by learning what TAG is and how to play it. If you do that half-decently, it will be enough to make you a break-even player if not a small winner. From there, you can decide how to build on this foundation.The best things to do is to get the basics right. By the time you get the basics right you will have enough experience to know what to ask in the forum. I would start with learning about hands, positions and odds. Play good hands from good position with favorable odds. Once you got the hang these concepts you will run into situation which raise questions for you. Post those questions in the forum and absorb the feedback. Over time your game will improve. Good Luck