Yes! An order I'll call a market order which you pay what it is currently trading at, which costs you a takers fee. A limit allows you to set a buy lower than the current price and sell at a higher price. So you don't have to sit and wait for your chance to jump in. You can say to yourself I won't pay more than X for this and then if the market meets your in the money
RE: Learn about Limits and stops, make the technology do the hard work for you