Have you ever stopped to think that the KDJ indicator most people use might be completely misconfigured? Yeah, that was an important discovery for me over the years of trading.

The KDJ has three lines: J, which fluctuates a lot (very sensitive), K in the middle, and D, which is more stable. People usually complain that the indicator gives bad signals, but actually the problem lies in the default system parameters, which are usually 9. With this adjustment, the daily KDJ becomes very volatile, constantly generating false signals.

But here’s the thing: if you tweak the parameters, the indicator changes its behavior. Based on my experience, the values 5, 19, and 25 work much better. Each of these values has its own effect depending on the asset and the timeframe you're trading.

Now, about how to use the KDJ in practice. The indicator works with the relationship between the highest price, lowest price, and closing price, and incorporates concepts of momentum and moving averages. This makes it quite fast and intuitive for short- and medium-term analysis. The values range from 0 to 100 (the J line can go outside this range), and when K crosses above D, it’s a potential buy signal; when it drops below, it’s a sell.

But there are some pitfalls. When the market enters a strong uptrend or downtrend, the KDJ becomes somewhat muted, losing effectiveness. Also, if the K line stays above 80 for too long, the price tends to fall in the short term; below 20, it tends to rise. However, often the indicator hovers around these zones without doing anything, leaving traders at a loss.

The most reliable signal I’ve found is when the J line moves out of the extremes (above 100 or below 0), especially if it stays there for three consecutive days. When that happens, it usually marks a short-term top or bottom quite accurately. It doesn’t appear all the time, but when it does, the reliability is high.

The more experienced traders I know specifically look for these J line signals to find the best entry and exit points. It may seem like a detail, but it’s basically the core of the KDJ indicator working properly. The tip is: don’t give up on the indicator just because the default parameters don’t work. Adjust, test, and you’ll see that it still has a lot of value for those who know how to use it.