In the common types of trading orders, a market order is executed immediately at the current market price, which is fast and convenient but the execution price is uncontrollable; a limit order is executed at the set price or a better price, which allows for cost control but may not be executed in a timely manner; a stop-loss order is triggered when the price reaches the set level, which can control losses; a take-profit order is executed to sell and lock in profits when the price reaches the expected profit point.