Order Types and Trading Basics

What you will learn

• Understand the difference between the "Bid" and the "Ask" price.
• Learn how a Market Order works and when to use it.
• Learn how a Limit Order works and why it protects you.

Core concepts

When you look at a stock on your brokerage app, you usually see the "last traded price." But when you actually go to buy or sell, you will encounter two different prices: the Bid and the Ask.

• The Bid is the highest price a buyer is currently willing to pay.
• The Ask is the lowest price a seller is currently willing to accept.

The difference between these two numbers is called the Spread. In large, popular companies, the spread is usually just a penny. In smaller, less frequently traded companies, the spread can be much wider.

When you are ready to buy or sell, you have to tell your broker how you want the trade executed. The two most common instructions are Market Orders and Limit Orders.

A Market Order prioritizes speed. You are telling the broker: "Buy (or sell) these shares right now, at whatever the best available price is."

A Limit Order prioritizes price. You are telling the broker: "Only buy these shares if the price is $50 or lower" (or, if selling, "only sell if the price is $50 or higher").

How execution changes outcomes

Choosing the right order type protects your money.

A Market Order is fine if you are buying a massive company (like Apple or Microsoft) during regular trading hours. There are so many buyers and sellers that the spread is tiny, and you will get a price very close to what you see on the screen.

However, Market Orders can be dangerous with smaller companies, or if you are trading in the pre-market or after-hours. Because there are fewer people trading, the spread might be wide. If you use a Market Order, you might end up paying significantly more than you expected. This unexpected extra cost is called "slippage."

A Limit Order acts as your safety net. By setting a maximum price you are willing to pay, you guarantee you won't get caught by a sudden price spike or a wide spread. The trade-off is that if the stock never reaches your limit price, your order won't execute at all. For beginners, getting comfortable with Limit Orders is a great way to build discipline and avoid overpaying in fast-moving markets.

Common mistakes

• Assuming the "last price" on the screen is exactly what you will pay.
• Using a Market Order on a small, thinly traded stock and getting hit with a bad price.
• Forgetting to cancel an old Limit Order that hasn't executed yet.