I just got called out by my roommate: “You backtest position management every day, but you can’t even hold spot yourself—let alone contracts…”

To put it simply, position management is just one sentence: don’t let any single trade affect your sleep.
I’ve backtested too many rules, and in the end I found that more reliable than any strategy is the position mindset of “being able to hold calmly even without knowing whether tomorrow will go up or down.” A lot of people get anxious—not because of the market, but because their positions are too heavy. For example, recently I’ve kept seeing the unlock calendar all over the place; sell-pressure anxiety comes wave after wave. If your position were lighter, then if it drops, so what? If it chops sideways, then let it chop.

In any case, I’ve gradually kicked my habit of “going all-in and waiting for a miracle,” and switched to “testing with a small position, then adding and reducing slowly.” The takeaway from a half-baked quant: no matter how good it looks in backtests, if you get liquidated, it all turns into zero.