I also read that to keep a journal for the trader is a must. It clearly shows your results and serves as a great way to correct your mistakes.
A regular review of one's trading journal is definitely important. Having your trades evaluated by other traders can be beneficial, too.
Anyhow, it is always necessary to read the people's thoughts about trading and strategies of this business. Even if you do not use them, you will find something very useful for you.
And this is how people use to exchange information to each other to expand their knowledge about trading. It is more informative than reading those books with lots of chapters that are time-consuming. Always take note the important part of trading that you think might help you in the future and always remember that in case you need it.