To prevent making snap decisions based solely on emotion, adhere to your predetermined trading plan and risk management techniques. Expand Your Investment horizons & Carry Out Extensive Study.sattakiga Another common mistake that traders should avoid is not diversifying their portfolio. Through diversification, you can lessen the impact of volatility on the performance of your entire portfolio and spread risk across a variety of assets. And last, one common error that can result in bad trading results is failing to conduct adequate research and analysis prior to placing trades.