BOLL, also known as Bollinger Band, is one of the technical indicators of stock \ futures \ foreign exchange investment, which mainly reflects the fluctuation pattern of stock price. The bollinger band consists of three moving averages. The upper yellow line (top) is the resistance line, the lower pink line (bottom) is the support line, and the middle white line (MB) is the moving average.

Generally, there are two situations:

1, convergence-that is, the resistance line and the support line shrink to the center line, indicating that the price fluctuation is reduced and consolidated;

2. Opening-that is, the resistance line and the support line are separated from the center line, indicating that the price fluctuation has increased and broken up or down.

General application rules of bollinger bands

1, the operation is not recommended when the bollinger band closes.

2. In the upward trend, when the opening price increases and the price breaks through the support line, you can buy long positions, and when the price crosses the resistance line, you can take profits. The center line can be used as an important support or take profit point.

3. In the downward trend, when the opening price increases and the price crosses the resistance line, it can be used as a short selling point, and when the price falls below the support line, it can make a profit.