A practical, platform-specific guide that shows options day traders exactly how to size every trade to a fixed max-loss and cap daily drawdown by 30%, with step-by-step workflows for Thinkorswim and Tastytrade. It includes a repeatable sizing formula for spreads and 0DTE trades, OCO/OTO bracket order recipes that enforce exits, a daily risk dashboard that shuts trading down when limits are hit, checklists, case studies, alert scripts, custom watchlist columns, and journal templates.