You have a couple of options for finding and plugging leaks: Marking up hands and going through them with a coach or poker friends, or analysing your play on your own. The first option is perhaps a bit easier, since you don’t have to find the answers by yourself: Just record your session or mark the hands that gave you trouble, and let your coach find the leaks and suggest corrections. The second option takes more work, but it should give you a deeper understanding of the game in general. Analysing your game can be done with the help of tracking software such as Poker Tracker or Holdem Manager. You can compare your stats to those of winning players, and analyse all types of stats of your own and those of your opponent’s. After you’ve played around with these tools for a while, you can learn more about the game than you previously thought possible.