Recently, someone asked me how to interpret moving averages, and I realized that many beginners actually have a somewhat biased understanding of this tool. Instead of saying that moving averages are predictive tools, it's better to see them as a compass that helps you stay on the right side of the trend.

Let's start with the basics. The full name of the moving average is the Moving Average Line (MA). Its core logic is quite simple—adding up the closing prices over a certain period and dividing by the number of days, which is the application of the moving average formula. For example, the 5-day moving average is the average cost basis over the past 5 days. As time progresses, this average updates continuously, forming that line. Essentially, it reflects where the market cost is.

The ones I use most often are the 20-day and 50-day lines. Why? Because too many moving averages can become noise. I've seen people fill their charts with 5-day, 10-day, 20-day, 50-day, 100-day, and 200-day lines—looks professional, but in reality, the signals conflict with each other. The real trick is that the moving average should correspond to your trading cycle. Short-term traders watch the 5-day or 10-day, swing traders look at the 20-day or 50-day, and long-term investors need the 100-day or 200-day. There’s no absolute standard; the key is to find settings that fit your trading system.

How to use it? I summarize three practical approaches. The first is to determine the trend direction. When the price is above the moving average and the moving average is trending upward, that’s a bullish signal. Conversely, if the price falls below the moving average and the line is trending downward, that’s a bearish signal. But more importantly, look at the arrangement of the moving averages themselves—if the short-term MA is above the long-term MA, that’s a bullish alignment; if the opposite, it’s bearish.

The second is to look for crossover points. When the short-term MA crosses above the long-term MA from below, it’s called a golden cross, usually a buy signal. Conversely, when the short-term MA crosses below the long-term MA from above, it’s called a death cross, indicating a sell signal. But I want to emphasize that this isn’t 100% accurate; it’s just a higher probability opportunity.

The third is to use moving averages as support and resistance. In a bullish trend, if the price retraces to the 20-day MA and doesn’t break below, it bounces back—that’s support. In a bearish trend, if the price rebounds and hits the MA, it gets pushed back—that’s resistance. Essentially, it’s about cost defense because most people’s costs are around these levels.

Here’s a limitation many overlook—the lagging nature of moving averages. They are based on past prices, so they always react a bit late. The longer the period, the more obvious the lag. So, relying solely on moving averages can be misleading. I usually combine them with RSI to check if the market is overbought or oversold, and confirm breakouts with volume. When the moving average, RSI, and volume all point in the same direction, your win rate significantly increases.

Regarding calculation, SMA is the simplest arithmetic mean, while WMA and EMA assign greater weight to recent prices. EMA is more sensitive to recent price fluctuations, so short-term traders tend to prefer it. But honestly, ordinary traders don’t need to manually calculate these; trading software will do it automatically.

Finally, I want to say that moving averages are not crystal balls. Many people expect that a golden cross will definitely lead to a rise, or a death cross will definitely lead to a fall—that’s the biggest misconception. The real value of moving averages is telling you where the current market cost is and which direction the trend is heading. They won’t tell you whether it will go up or down tomorrow, but they can help prevent you from trading against the trend.

My advice is to open your charting software, keep only the 20-day and 50-day moving averages, find a market with a clear trend (like recent tech stocks or precious metals), and test a trend-following retracement strategy on a demo account for two weeks. You’ll find that moving averages are actually more useful than you think. There’s no perfect indicator—only continuously optimized trading systems.