The difference between a market order and a limit order. One time I used a market order during a period of high volatility, and the trade was executed at a price far from what I expected, resulting in a loss I wasn't prepared for. After this experience, I primarily started using limit orders because they give me full control over the price. Also, stop-loss orders helped me protect my capital from unexpected fluctuations. My advice to every beginner: don't start trading until you fully understand how these orders work.