A 25-page course on the part of trading you can control: how much you lose when wrong. Covers loss and recovery math, the 1% rule, the position sizing formula with buying-power checks, stop placement and slippage, R-multiples, expectancy, daily and weekly limits, margin and gap risk, journaling, and a one-page personal risk policy. Includes a 3-page sizing worksheet and printable journal. Risk note: most day traders lose money; education only, not financial advice.