Many people get liquidated on contracts, but few reflect on the true reasons—most simply don't understand how to roll their positions.

The common ways to die are these: a small rally makes you run away fearing a retracement; a dip prompts hard re-adding to try to recover losses; by the time the trend really arrives, you've already been washed out.

How do seasoned traders do it? Actually, just follow one principle:

**Cap the principal, only use profits to trade.**

When the market is unclear, keep your position as light as possible—if you're wrong, admit it without hesitation; only after locking in real gains do you gradually add to your position with the profits, never risking your entire wealth.

The moment floating profits exceed the principal, the top priority isn't greedily adding more, but locking in gains and setting up hedges.

When the market is at a crazy peak? Use the smallest position to test the waters—if you catch it, good luck; if not, you lose nothing.

The market never rewards reckless courage; it only rewards those who survive long and stick to trading discipline. When you use the rolling position strategy correctly, the market will naturally help you realize your profits.