In contract trading, there is no method that can guarantee 'never losing', but the following are some strategies and principles that can help you reduce losses and improve the probability of profit:

Risk Management

Set Stop Loss: Set stop loss points before each trade to ensure losses are within a controllable range,

Control Position: Avoid full position operations, allocate funds reasonably to reduce the risk of a single trade,

Trend Following: Look for support levels to go long in an uptrend, and resistance levels to go short in a downtrend, avoiding counter-trend operations.

Technical and Strategy

Technical Analysis: Learn and apply technical analysis tools, such as candlesticks, moving averages, trend lines, etc., to assist in judging market trends.

Trend Trading: Focus on the 'highs' and 'lows' of prices to define trends, and act in accordance with the trend.

Fund Management: Always set stop losses, with a single stop loss not exceeding 2% of total funds, and immediately liquidate when total funds lose 30%.

Mindset and Discipline

Stay Calm: Avoid emotional trading, stick to your trading plan, and do not make impulsive decisions due to greed or fear.

Continuous Learning: The market is dynamic and ever-changing; continuous learning and improving trading skills is necessary.

Practical Mnemonics

'Act in accordance with the trend, do not go against it; stop losses and take profits should be timely.'

'Light position operations are as steady as a mountain; heavy position operations are likely to capsize.'

'The market carries risks; investment requires caution.'

Please remember that any investment carries risks, including the risk of losing principal. The above information is for reference only and does not constitute any investment advice. In actual operations, please be sure to consider your own risk tolerance and investment goals, and make cautious decisions.