Recently, some beginners have asked me how to use RSI, so I might as well organize my understanding of this indicator. To be honest, RSI is one of the most intuitive technical indicators, especially suitable for newcomers to quickly get started.

Let's start with the most practical part. RSI uses a value from 0 to 100 to measure the strength of price movements over a certain period. Above 70 indicates the market may be overly optimistic, while below 30 suggests excessive pessimism. It sounds simple, but this overbought and oversold logic can indeed help you avoid many risks. My personal habit is to consider reducing positions when RSI exceeds 70, and to watch for rebound opportunities when it drops below 30.

If you want to understand this indicator more deeply, you need to understand the logic behind the RSI formula. RSI = 100 – (100 / (1 + RS)), it looks complicated, but broken down into four steps. First, calculate the daily price change over the selected period, usually a default of 14 candles. Then, compute the average gain and average loss, and divide the average gain by the average loss to get the RS value. Finally, plug RS into the RSI formula to get a value between 0 and 100. The core logic of this RSI formula is to use relative strength to judge the market’s bullish and bearish momentum.

Parameter settings are something many people tend to overlook. The default RSI 14 is suitable for medium to long-term swings; using it on 4-hour and daily charts works well. If you're a short-term trader, try RSI 6, which reacts much faster, but false signals will also increase. For long-term use, RSI 24 makes the indicator more sluggish, with fewer false signals but fewer entry opportunities. There’s no absolute best parameter; only what suits your trading style.

Besides the overbought and oversold zones, RSI divergence is also an important signal. Simply put, it occurs when the price makes a new high but RSI doesn’t follow, or the price hits a new low but RSI doesn’t go lower—this usually indicates momentum is weakening. Bearish divergence often signals insufficient upward momentum, while bullish divergence suggests decreasing downward pressure. But be careful, divergence doesn’t necessarily mean a reversal; it should be confirmed with other indicators or candlestick patterns.

The biggest pitfall when using RSI is over-reliance. In strong trending markets, RSI can stay above 70 or below 30 for a long time. Relying solely on overbought or oversold signals to enter long or short positions can easily lead to being trapped. Also, pay attention to time frame matching: if the hourly chart shows oversold signals but the daily chart is still in a downtrend, the hourly signals may be suppressed.

Ultimately, RSI is just a tool. A truly robust trading strategy should incorporate MACD, moving averages, or candlestick patterns. The values calculated by the RSI formula are very valuable as references, but they shouldn’t be the sole basis for decision-making. My approach is to use RSI 14 to observe the overall trend, combined with divergence signals to identify turning points, and confirm entry points with candlestick patterns. This combination tends to improve the consistency of success rates.

Finally, a reminder—indicators are just tools. Market changes are always more complex than any indicator. When beginners use RSI, don’t rush into placing orders. Spend time backtesting to find parameters and strategies that suit you. Only when you’re confident should you start real trading.