How to Read the Options Greeks (Without the Math Headache)
Delta, theta, and the two others that actually change how you trade.
The options Greeks sound like a math exam, but for an income trader they're really just four dials that tell you what a trade will do. You don't need the calculus behind them — you need to know which dial does what.
Delta is the big one. It tells you roughly how much an option's price moves when the stock moves a dollar, and — handily — it doubles as a rough probability that the option finishes in the money. When you sell a covered call at "30 delta," you're loosely saying there's about a 30% chance your shares get called away. That single number drives most of your strike selection.
Theta is the one working in your favor when you sell options. It's time decay — the small amount of value an option bleeds off every day it ages. As a seller, theta is the wind at your back; every day that passes without the stock moving against you puts a little more of that premium safely in your pocket.
The other two — gamma and vega — matter more as you take on size and leverage, because they're what make a calm position suddenly move fast. That's exactly the territory where borrowed money turns a manageable trade into a dangerous one.