A truly usable trading system is essentially a "complete closed loop from coin selection to exit." Many people lose money in trading, and frankly, it's because they lack any of these six major modules or rely solely on subjective judgment within the modules. Today, let's break down how to set it up specifically.

**First Module: Trend Judgment**

First, clarify the current market condition. Many people get stuck here—they hesitate to buy when there's a trend, and repeatedly buy the dip when there's no trend. The criteria must be quantifiable, not based on feelings. For example, use the 20-day moving average combined with high and low points: if the 20-day MA is trending upward, and each low point is higher than the previous one, and each high point is also higher than the previous one, then it's an uptrend. Only go long in an uptrend; stay away from the downtrend.

**Second Module: Entry Signal**

"When to buy" must have clear conditions, not impulsive decisions. You can combine candlestick patterns, technical indicators, or price action. For example, in an uptrend, if the price falls back near the trendline and forms a hammer candlestick, with decreasing volume indicating support is valid, then it's a good entry point. Or, if the MACD crosses above the zero line, and the price does not break below the 5-day moving average, that's also a signal. The key is that signals should be "unique and clear," not subject to frequent changes.

**Third Module: Stop-Loss Setting**

Before trading, you should decide "how much loss is acceptable before exiting." This is true risk control. Trading without a stop-loss is like driving without a steering wheel—inevitably, accidents happen. Stop-loss can be set using a fixed percentage (for example, exit if loss reaches 5%) or based on key technical levels (exit if it breaks below a certain moving average).