How to set the stop-loss level? How many points to exit?

I can go one day, three days, or five days without opening a position; I only take positions that I have verified to have high certainty in the past. What is verification? Doubling is the best verification. If you set a stop loss, your win rate for opening positions should be at least around 60%, otherwise, it may not be stable. Even with a 60% win rate, after deducting profits, it goes back to breakeven, so the actual effective win rate is around 40%. Not holding positions means you will never incur large losses, and not having large losses is the essence of development.