Options & 0DTE Radar
A one-page, dark-mode cheat sheet for remembering what calls, puts, strike price, bid/ask, and 0DTE actually mean when you’re staring at a real options chain.
Learning Mode Calls vs Puts Bid / Ask / Spread 0DTE Flow
Core Idea: What an Option Actually Is
foundation

An option is a contract that gives you the right, but not the obligation, to buy or sell 100 shares of a stock or ETF at a specific strike price on or before a certain date (expiration).

Call = right to buy (bullish) Put = right to sell (bearish) 1 contract ≙ 100 shares

You pay "premium"

The price of the option is the premium. If a contract shows 1.25, it actually costs 1.25 × 100 = $125.

Call in one line
You pay premium now, hoping the stock ends up above the strike. Profit potential is (roughly) unlimited, loss is limited to the premium you paid.
Put in one line
You pay premium now, betting the stock will go down. The lower it goes below the strike, the more the put can be worth (until it hits zero).
Key memory hook
Calls up, puts down. Calls want price up and above the strike. Puts want price down and below the strike.
Strike Price & ITM / OTM
where price has to cross

The strike price is the level the underlying needs to be above/below for the option to have intrinsic value at expiration.

For calls

  • In The Money (ITM): stock price above strike.
  • At The Money (ATM): stock price ≈ strike.
  • Out of The Money (OTM): stock price below strike.

For puts

  • ITM: stock price below strike.
  • ATM: stock price ≈ strike.
  • OTM: stock price above strike.
Break-even (simple view)
Call: break-even ≈ strike + premium
Put: break-even ≈ strike − premium
Example
Stock = 11.22
Call strike = 10
Intrinsic now = 11.22 − 10 = 1.22
Bid, Ask & The Spread
how you actually get filled

Every option is constantly being quoted with two prices:

  • Bid: highest price someone will pay right now.
  • Ask: lowest price someone will sell for right now.

The difference between them is the spread. The mid is halfway between.

Example call quote
Bid = 0.62
Ask = 2.01
Mid ≈ (0.62 + 2.01)/2 ≈ 1.32
If you buy at the ask and immediately sell at the bid, you donate the spread.
Your actions
  • Buy → you lift the ask.
  • Sell → you hit the bid.
  • Better: use limit orders near the mid, especially with options.
Rule of thumb: tight spreads are friendly. Wide spreads are where small accounts go to die, slowly.
0DTE: Zero Days to Expiration
hyper-short term

0DTE means the options expire today. On the chain, it’s simply the expiration date that matches today’s date.

Why it’s wild
  • Time is almost gone → very little time value.
  • Option price becomes ultra-sensitive to small price moves.
  • Tiny move in the stock can cause massive % swings in the option (up or down).
What traders try to do
  • Scalp intraday moves with calls/puts.
  • Aim for quick +20–50% on the option while cutting losers fast.
  • One stubborn trade can nuke the account.
Key memory

0DTE = you’re not buying “time,” you’re buying leverage on today’s price move, with the clock trying to kill the contract by the closing bell.

Flow of a Single Options Trade
from idea to exit
  1. Pick a ticker (SPY, QQQ, TSLA, NVDA, etc.) and your direction (up → call, down → put).
  2. Choose DTE (days to expiration) and strike (how aggressive vs conservative you want to be).
  3. Check bid/ask and volume. Avoid huge, ugly spreads when learning.
  4. Decide position size (how many contracts, how much you’re willing to lose).
  5. Set your plan: take profit at +X%, cut loss at −Y%.
  6. Enter with a limit order near the mid, not a random market slap.
  7. Stick to the plan. No “it’ll come back” heroics.
Mini break-even calculator
Break-even will appear here.
Important: break-even is a simple expiration concept. In real life, options can be profitable before hitting break-even because of time value and volatility — but this gives you a clean anchor.
Risk, Reality & Account Size
tuition, not magic

You can technically open an account with very little money, but the smaller it is, the more each mistake hurts.

  • Mechanical minimum: enough to buy 1 contract (e.g., a $0.40 option → $40).
  • Learning account: something like $300–$500 you are willing to treat as tuition.
  • Risk per trade: many traders keep it to 1–5% of account, not all-in.
  • 0DTE: extremely volatile; best approached after you understand how regular options behave.
Why 95% win-rate screenshots are suspicious ▶

Most “I win 95% of the time on 0DTE!” posts are in a small window where the trader hasn’t yet hit the huge loss. With leveraged options, one undisciplined trade can wipe out a long streak of tiny wins. Screenshots rarely show the blown accounts.

Safer learning progression ▶
  1. Paper trade to learn the mechanics.
  2. Start real money with small, liquid, non-0DTE calls/puts.
  3. Use tight risk and log every trade and reason for entry / exit.
  4. Only experiment with 0DTE later, with size you can truly afford to lose.