Intermediate path Β· 18 min
Calls, puts, the Greeks, breakeven, expiry β all in plain English with worked examples you can follow.
An option is a contract that gives you the right, but not the obligation, to buy or sell a stock at a fixed price before a fixed date. You pay a small fee (the premium) for that right. If you don't use it, the option expires and you lose the fee. That's it.
The right to BUY the stock at a fixed price before expiry. You buy these when you think the stock will go UP.
The right to SELL the stock at a fixed price before expiry. You buy these when you think the stock will go DOWN β or to insure shares you already own.
The fixed price at which you can buy (call) or sell (put) the underlying.
The last day the option can be exercised. After this, the contract is worth $0 (or whatever it's still 'in the money' for).
The price you pay for the option. The market sets this based on how likely the option is to end up profitable.
For a call: breakeven = strike + premium. For a put: breakeven = strike β premium.
That's the price the stock needs to hit by expiry for you to walk away exactly even. Anything past it is profit; anything short is a partial or total loss of the premium.
The Greeks measure how the option's premium reacts to different forces. You don't need to calculate them β your broker shows them. You just need to know what each one means so you can read the screen.
For every $1 the stock moves, the option premium moves by Ξ dollars.
How fast Delta itself changes. High gamma = option's sensitivity is accelerating.
Time decay. How much premium evaporates each day, all else equal. Calls and puts both lose theta over time β "rent on the contract."
How sensitive the premium is to changes in implied volatility (the market's expectation of how much the stock will swing).
Sensitivity to interest rates. Matters mostly for very long-dated options. Most short-term traders ignore it.
Not technically a Greek, but quoted alongside them. Beta describes the UNDERLYING stock's sensitivity to the whole market.
When you click βOptions chainβ on any broker, you see a long grid of strikes Γ expiries. Most beginners freeze. A simple framework:
Strike near the current stock price. Delta ~0.5. Most balanced β meaningful upside if you're right, meaningful loss if you're wrong.
Strike further from the current price (above current for calls, below for puts). Cheap, low Delta. Lottery-ticket style β usually worthless, occasional big winner.
Strike past the current price (below for calls, above for puts). Expensive, high Delta. Behaves more like the stock itself.
And for expiry:
Leverage. You pay $300 for an option that controls $20,000 of stock. If you're right, the % return is enormous. If you're wrong, you lose $300.
Insurance. You own 100 shares of AAPL, you buy a put to cap downside ahead of earnings. Premium is the cost of sleeping well.
Already own 100 shares of AAPL? Selling a call against them collects premium today, in exchange for capping your upside if AAPL rips.
Strategies like "spreads" cap both your max gain and max loss to known numbers β useful when you want a clean risk envelope.
Both regions require an extra approval step beyond a basic brokerage account.
Not financial advice. This page is educational only β it explains concepts so you can decide for yourself. Nothing here is a recommendation to buy, sell, or hold any security or asset.