Trading. In order.

Signals, sizing and the discipline that keeps an account alive.

10 problems~3h5 easy5 medium0 hard

paper only · educational · not advice

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39VWAP
Volume-weighted average price, anchored to the session open.
easy15 minstart →
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40Kelly fraction
The bet size that maximises long-run growth — and why you halve it.
easy15 min
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41SMA crossover signals
Fast over slow is long — flag every cross.
easy15 min
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42Donchian breakout
Buy the 20-day high, sell the 20-day low.
easy15 min
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43Position size from stop distance
Risk a fixed fraction per trade and let the stop set the size.
easy10 min
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44Long-only backtest with costs
Turn signals into equity, then charge commissions and slippage.
medium30 min
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45Order-book mid & micro-price
Mid is the average; micro-price weights it by the other side's size.
medium20 min
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46Drawdown-aware kill switch
Halt trading when the day's loss breaches the limit — and stay halted.
medium20 min
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47Wheel cash-flow ledger
Sell puts, get assigned, sell calls — book every premium.
medium30 min
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48Theta bleed to expiry
How an option's value decays day by day, everything else held still.
medium20 min