Recently, a friend asked me how to use RSI to determine entry points, and I realized that many people's understanding of this indicator still stays at the surface level of "overbought and oversold." In fact, RSI's applications go far beyond that.

Let's start with the most intuitive part. RSI stands for Relative Strength Index, which simply measures the strength of upward and downward momentum over a period of time using values from 0 to 100. When the market is strongly bullish, the value rises; when the bearish trend dominates, it falls. The logic is very clear.

Many people have heard of the concept of "overbought and oversold," which is actually the basic application of RSI. When RSI exceeds 70, the market may be overly optimistic, with a risk of a pullback; conversely, when RSI drops below 30, the market is overly pessimistic, usually indicating a rebound opportunity. But I want to emphasize one point—overbought and oversold are just reminders that the market's short-term reaction is excessive, not a guarantee of reversal. Many beginners lose money here.

Regarding parameter settings, this is a detail many overlook. The default RSI 14 is suitable for medium to long-term swings, and looking at 4-hour or daily charts is still fine. But if you're a short-term trader, try RSI 6; the sensitivity will be significantly higher, and signals will come faster. Of course, this also increases false signals, so it needs to be filtered with other tools. Long-term traders can use RSI 24, which reduces noise considerably, but entry opportunities become relatively rare.

I think the concept of divergence is more practical than overbought and oversold. Simply put, it occurs when the price makes a new high but RSI doesn't follow suit, or the price hits a new low but RSI doesn't make a new low. This often indicates that momentum is starting to weaken. Bearish divergence is usually a sell signal, while bullish divergence suggests a buying opportunity. TradingView has automatic detection features, so you can spot it just by looking at the chart.

How is RSI calculated technically? First, calculate the daily price change, then compute the average gain and average loss, divide the average gain by the average loss to get RS, and finally apply the formula RSI=100–(100/(1+RS)). Honestly, nowadays chart software does this calculation for you; you just need to know how to interpret it.

My personal habit with RSI is this: first, look at the RSI trend on larger timeframes (daily or 4-hour) to judge overall momentum, then use smaller timeframes to find specific entry points. I also combine it with candlestick patterns and moving averages because relying solely on RSI can lead to pitfalls. Especially in strong trending markets, RSI can give false signals—you might see it staying in the overbought zone, but the price just keeps going up.

Another common misconception is ignoring the differences in time cycles. For example, if you see an oversold signal on the 15-minute chart and rush to buy, but overlook that the daily RSI just crossed below the midline, the signal on the hourly chart might be suppressed. I've seen this happen too many times.

In summary, RSI is indeed a quick and practical indicator, especially suitable for beginners learning technical analysis. But remember, it’s just a tool, not a holy grail. Adjust parameters to fit your trading style, and combine it with MACD, moving averages, or candlestick patterns. That’s a more stable way to trade. Blindly relying on a single indicator and signals will eventually teach you a harsh lesson from the market.