Options Basics: Calls and Puts Explained Without the Jargon

Options have a reputation for being complicated and risky. They can be both. But the core idea is easier than most people expect, and understanding it is the foundation for strategies like covered calls. Let's take it slowly.

An option is a contract

A stock is ownership in a company. An option is different: it's a contract that gives the buyer a right, but not an obligation, to buy or sell a stock at a set price before a set date.

Every option has two sides:

• The buyer pays money for the right.
• The seller (also called the writer) receives that money and takes on an obligation if the buyer uses the right.

In the U.S., one standard stock option contract usually represents 100 shares.

The four words you must know

1. Underlying: the stock the option is based on.
2. Strike price: the set price at which the stock can be bought or sold.
3. Expiration date: the last day the option is valid.
4. Premium: the price of the option. The buyer pays it; the seller receives it.

Option prices are quoted per share, so a quoted premium is multiplied by 100 to get the cost of one contract. Hypothetical example: a premium quoted at $1.20 means $120 per contract.

Call options: the right to buy

A call gives the buyer the right to buy the underlying stock at the strike price before expiration.

People who buy calls generally expect (or hope) the stock will rise above the strike price. People who sell calls receive the premium and accept the obligation to sell shares at the strike if the buyer exercises.

Put options: the right to sell

A put gives the buyer the right to sell the underlying stock at the strike price before expiration.

People who buy puts are often protecting shares they own from a drop, or expecting a decline. People who sell puts receive the premium and accept the obligation to buy shares at the strike if the buyer exercises.

A memory trick: call = call it up to you (buy). Put = put it onto someone else (sell).

In, at, or out of the money

• In the money (ITM): the option has built-in value. For a call, the stock is above the strike. For a put, the stock is below the strike.
• At the money (ATM): the stock is right around the strike.
• Out of the money (OTM): no built-in value yet. For a call, the stock is below the strike. For a put, the stock is above it.

What's inside an option's price

An option's premium is made of two pieces:

• Intrinsic value: the built-in value if exercised right now (zero for out-of-the-money options).
• Extrinsic value (time value): everything else, driven by time left until expiration and implied volatility, which is how much the market expects the stock to move.

Time value shrinks as expiration approaches. That shrinking is called time decay, and it's a central idea in covered calls.

The risks are real

• Option buyers can lose the entire premium they paid. Options can expire worthless.
• Option sellers take on obligations. Some selling strategies, like selling calls on shares you don't own, can carry very large or even unlimited risk.
• Leverage cuts both ways. Because one contract controls 100 shares, small stock moves can mean large percentage changes in an option's value.

This is why most brokers require you to apply for options approval and assign you a "level" based on experience. It's also why we encourage learners to start with defined, well-understood strategies and to practice first.

Where covered calls fit

A covered call is when someone who already owns 100 shares sells a call option against them. The shares "cover" the obligation. It's often one of the first strategies people learn because the risk profile is easier to understand than many others. We explain it fully in our covered call basics post, and you can get the free Covered Call Starter Checklist to walk through the key questions step by step.

Key takeaways

• An option is a contract giving a right (buyer) or obligation (seller).
• Calls are about buying; puts are about selling.
• Know the strike, expiration, premium, and that one contract usually covers 100 shares.
• Premium = intrinsic value + time value.
• Options carry real risk; learn and practice before using real money.