Is a trading journal necessary?
A trading journal is a record of a trader's actions, behaviors, and trading activities on a daily, weekly, or monthly basis. It helps traders learn from their mistakes and maximize their winning strategies.
By recording and reviewing their trading journal, traders can:

Analyze their skills: Evaluate if their analytical skills are consistent and if they have adhered to their trading discipline.
Monitor their psychology: Examine their behaviors after placing a trade. Have they managed their capital effectively? How have their emotions affected their decisions before and after entering a trade?

Observe their ego: Observe their thoughts, greed, and fear during a trade. How excited or scared were they? How did the volume of their orders affect their fear level? By regularly observing these negative trading habits, traders can gradually eliminate them, similar to daily practice and meditation. This helps them develop better trading habits in the future. Therefore, traders should record both successful and unsuccessful trades to self-reflect and identify recurring patterns. By eliminating negative behaviors and maximizing positive ones, traders can gradually develop good trading habits over time.