Order typeA market order instructs the brokerage agency to complete the order at the best available price. A limit order is an order to buy or sell shares at a specific price or better. A limited sell order instructs the broker to sell the asset at a price higher than the current price. You have already found the symbol for trading with “LUV” and you can enter the number of shares you want to buy.
Many virtual trading accounts implement a position limit that requires you to diversify in order to buy up to 25% of the value of your portfolio. In real money brokers, of course, you can “put all your eggs in one basket” and buy as many shares of a stock as your cash and purchasing power allow. Go to your free virtual trading account and you'll see several options for the order type: market, limit and stop.