If you want to be a successful trader then you are going to have to suffer. You will experience the highest highs and the lowest lows as you climb the mountain of trading success. On this journey there will be one skill that will be more valuable to you than all others, and that is the ability to learn from your mistakes. In order to succeed in trading you are going to have to analyze every trading decision that you make, and the best way to do that is through a trading journal.