A trading journal can be extremely useful for traders due to the fact that you will always be monitoring your performance through recording all your trades and reviewing the actions you took when trading that asset. The journal will also allow you too see what your entry, stop and target was so you can decide what works best for you. Furthermore, it acts as a mental note and a lesson to many as you can always revisit to see what mistakes you made and what good things you followed, which will allow traders to follow good practises before making a trade.