Some of the biggest mistakes traders make in forex trading include over-trading, failing to use risk management strategies, letting emotions drive trading decisions, and not having a solid trading plan in place. Other mistakes include failing to adapt to changing market conditions, relying too heavily on technical indicators, and not learning from past mistakes. Additionally, traders may make mistakes by not doing their research on brokers or trading scams, or by failing to adequately educate themselves on trading strategies and tools. To be successful in forex trading, it's important to recognize and learn from mistakes and to continuously work to improve your skills and approach.