The truth is that I do not keep such a journal, but in my trading experience, keeping a trading journal is good. This will help the traders to take the inventories of their trading mistakes and also point to their trading strengths and weaknesses so that the trader can make the correction and work more on the strengths to improve it and avoid the weaknesses. This is collective way to evaluate the trading performance of that trader, so it has no disadvantage.

But in my training time, I may not have such a quality book but I can assure you that in my brain, I store all those functions and continue to improve in myself. For this, I can say that a trading journal is not necessary if you can handle it yourself, but it's an external book that will help our forgetfulness as humans.