#TradingMistakes101 The first major mistake is trading without a plan. Entering trades without a clear strategy often leads to poor decisions and losses. The second ...From trading without a plan to not cutting your losses, learn what the most common trading mistakes traders make are, and howWithout stop-losses, you're risking everything. Protect your capital — always have an exit plan. 3. Overtrading. More trades ≠ more profits.