Depending on the type of order you choose, your execution price may differ from the price specified in your order.
Market orders are executed at the current market price, you should be aware during periods of high volatility or when placing large orders as you may experience slippage.
Stop orders are implemented as a brokerage function and are not immediately place in the order book. Therefore, triggered stop orders are not guaranteed to be executed on the exchange at the exact time of triggering. Once a stop order is triggered, an order is submitted to the exchange; however, in a fast-moving market, you may experience slippage.
Limit orders give traders the most amount of control over their execution price but come at the cost of having no guarantee of being filled.