มือใหม่ครับ ทุกคนจัดการขนาดการเทรดในวันที่ผันผวนกันยังไง?

That's a really good question, and something I've been wrestling with too. I've heard some talk about using ATR to dynamically adjust, but I'm not entirely clear on the practical application. Do you factor in the daily volatility or something else?

I tend to stick to a fixed percentage of my account per trade, and that naturally scales down in volatile periods when stop losses might need to be wider. It prevents the need for daily recalculations.