The disciplined long-call setup: 0.50–0.70 delta strike, 30–60 DTE, on a stock with a clear directional thesis and IV rank below 50. The delta gives you meaningful exposure without paying for excess time premium. The DTE gives the thesis room to play out. The IV rank requirement matters because long calls bleed when IV contracts — buying at high IV means you need a much bigger move just to break even.
Common mistake: buying cheap far-OTM calls because the leverage ratio looks attractive. A $1.00 call on a $100 stock at the $110 strike with 30 DTE has roughly a 15% chance of finishing ITM. The 6× theoretical payoff on a winner is real, but win rate of 15% × 6× return = 0.9 expected value, before slippage. The math doesn't work without an extreme directional edge most retail traders don't have.