Recently, many beginners have asked me how to use RSI, so I might as well share some of my insights from these years. To be honest, RSI (Relative Strength Index) is one of my most frequently used indicators because it’s really intuitive — just look at the numbers to judge whether the market is overreacting.

Let’s start with the most practical part. When RSI exceeds 70, the market is usually overly optimistic, and at this point, I start to pay attention to the risk of a pullback; conversely, when RSI drops below 30, the market may be overly pessimistic, and a rebound opportunity arises. But here’s a trap — RSI above 70 doesn’t necessarily mean you should short, because in strong trending markets, RSI can stay at 80, 90 for a long time, and only then is the true top formed. So I usually combine it with other signals for judgment.

If you want to understand why RSI is so useful, you need to know the logic behind its formula. The principle isn’t complicated: RSI = 100 – (100 / (1 + RS)). It looks intimidating, but breaking it down, it’s about calculating the average gains and average losses over a certain period, then computing the Relative Strength (RS), and finally applying the formula. The default period is 14 candles, so the resulting value ranges between 0 and 100. The closer to 100, the stronger the upward momentum; closer to 0 indicates dominant downward momentum.

Regarding parameter settings, I recommend adjusting based on your trading style. Short-term traders can try RSI 6, which reacts quickly and signals early, but it also produces more false signals, so more filters are needed for confirmation. I personally prefer RSI 14 (which is also the default on most platforms), suitable for 4-hour and daily charts for medium-term trading. If you’re a long-term investor, RSI 24 might be better, as it’s less sensitive to short-term fluctuations and avoids being fooled by minor swings.

Besides overbought and oversold levels, RSI divergence is also a common trading signal I use. Divergence occurs when the price makes a new high but RSI doesn’t follow, or the price makes a new low but RSI doesn’t confirm. This usually indicates momentum weakening and could be a sign of a reversal. Bearish divergence (price new high, RSI drops) suggests a potential decline, while bullish divergence (price new low, RSI rises) hints at a possible rally. But remember, divergence alone doesn’t guarantee a reversal; it should be combined with candlestick patterns and trendlines.

Finally, a key tip: don’t rely too heavily on a single indicator. I’ve seen many traders enter positions based solely on RSI, only to get trapped in strong trending markets. The most reliable approach is to combine RSI with other tools like MACD, moving averages, and candlestick patterns — this increases your win rate. RSI is just a tool to help you judge whether the market is overreacting and whether momentum is sufficient; it’s not a magic bullet.

In summary, if you’re new to technical indicators, RSI is a great starting point — easy to learn and practical. Find the parameters that suit you, develop a clear trading rule, and then use overbought/oversold and divergence signals to assist your decisions. Of course, the most important things are risk management and mindset — indicators are just tools; the real key to success is your execution.