I'm not very good at explaining those lofty trading systems; frankly, I have just one straightforward rule: cut out the "deadly blow." If you can't hold spot, it's probably because your position is too large, and a small rise or fall starts your mind racing; futures will get liquidated—more directly, leverage plus full position equals an eventuality. My approach is pretty simple: only trade what I can sleep peacefully with, and if it drops, pretend I didn't see it and it won't affect my life; if I really want to play futures, treat it as a one-time ticket expense, set a loss limit in advance, and close it when reached instead of holding on stubbornly. Recently, there's been a lot of noise about pledging and sharing safety with the "compound earnings" approach—I see it as just stacking up risks too. If the position keeps stacking up, I definitely wouldn't dare. Staying alive is more important than making quick money.