0DTE Options: Trading the Same-Day Market: A Practical Guide to Same-Day Options, Greeks, Market Structure, Execution, Risk Control, and High-Speed Decision-Making

Faramarz Kowsari takes the reader beyond the simple question of whether the market will move up or down. In 0DTE trading, direction alone is rarely enough. Time decay, gamma exposure, implied volatility, liquidity, market structure, execution quality, position sizing, and expiration mechanics can change the outcome of a trade within minutes.

The book begins with the foundations of zero-days-to-expiration options and the option chain, then develops a practical understanding of Delta, Gamma, Theta, Vega, implied volatility, and the interaction between the Greeks.

Readers then move into market structure and practical trade construction, including directional calls and puts, debit spreads, credit spreads, iron condors, butterflies, broken-wing butterflies, straddles, strangles, momentum setups, breakouts, continuation trades, mean-reversion opportunities, failed moves, and late-day gamma behavior.

Execution is treated as part of the strategy itself. The book examines bid-ask spreads, liquidity, slippage, assignment, exercise, settlement, expiration risk, position sizing, stop logic, trade invalidation, daily loss limits, scheduled economic events, and conditions in which the correct decision is not to trade.

The later chapters show how to build a repeatable 0DTE playbook, backtest without misleading assumptions, evaluate metrics beyond win rate, maintain an evidence-based trading journal, and manage the psychological pressure produced by compressed time and rapidly changing P&L.

Ten full trade labs examine trend trades, debit and credit spreads, failed breakouts, mean-reversion losses, event-day volatility, losing straddles, late-day gamma reversals, execution failures, and deliberate no-trade decisions. The book also identifies common mistakes that can quickly destroy a 0DTE trading account.

This is not a book about a magical zero-day strategy. It is about developing disciplined decisions in a market where the clock is part of the position.

Designed for options traders, day traders, active market participants, and readers seeking a deeper practical understanding of same-day expiration options, Greeks, execution, market structure, and risk control.