Recently, someone asked me how to use RSI, so I might as well talk about this indicator. Honestly, RSI (Relative Strength Index) is one of the most intuitive tools I’ve used; its 0 to 100 value can reflect the short-term momentum of market rises and falls, making it really simple to use.

The logic of overbought and oversold is straightforward—an RSI above 70 suggests the market may be overly optimistic, with a risk of a pullback; below 30 indicates the market is overly pessimistic, possibly brewing a rebound. But this is just a reminder, not a guarantee. I’ve seen too many people go short immediately when they see overbought, only to get squeezed out—that’s the easiest trap to fall into with RSI.

When it comes to parameter settings, that’s the real key to whether RSI is useful or not. The default RSI 14 is suitable for medium to long-term swings, which I often use; if you’re a short-term trader, try RSI 6, which reacts much faster but also produces more false signals; if you’re a highly conservative long-term investor, RSI 24 will make the indicator less sensitive, with fewer signals but higher accuracy. Choosing the right RSI parameters can significantly improve signal quality.

Divergence signals are also worth paying attention to. When the price hits a new high but RSI doesn’t follow, that’s called a top divergence, usually indicating weakening momentum and a possible reversal downward; conversely, a bottom divergence occurs when the price hits a new low but RSI doesn’t break the new low, suggesting selling pressure is weakening. However, divergence doesn’t mean the trend will reverse immediately; I usually confirm with candlestick patterns or other indicators before entering a trade.

In practice, I most often combine RSI with time cycles. An oversold RSI on the hourly chart is tempting, but if the daily RSI is still above the midline, that entry signal is basically invalid. That’s why RSI parameter selection should match your trading timeframe—blindly applying default settings can easily lead to mistakes.

Finally, a reminder: RSI is just a tool, not a holy grail. I’ve seen too many beginners decide to buy or sell solely based on RSI, only to end up losing big. Combining RSI with MACD, moving averages, or candlestick patterns is the way to go, and you should also carefully consider your risk tolerance. When you choose the right RSI parameters and have a complete trading plan, you can navigate the market more steadily.