Bollinger Bands: The English bollinger indicator was created by Mr. John Bolling. He used the statistical principle to find out the standard deviation of the stock price and its confidence interval, thus determining the fluctuation range and future trend of the stock price, and using bands to represent the safe high and low price of the stock price, so it is also called Bollinger Bands. The upper and lower limits are not fixed, but change with the stock price rolling. Like Mike's indicator, the Brin indicator belongs to the path indicator, and the stock price fluctuates in the upper and lower range. The width of this band varies with the fluctuation of stock price. When the stock price rises and falls, the banded region becomes wider, the fluctuation range becomes narrower and the banded region becomes narrower when it is consolidated.

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Multi-space Bollinger Band: A multi-space Bollinger Band (BBIBOLL) is an orbit line with the multi-space line as the center line and the standard deviation of the multi-space line as the bandwidth. UPR line is the pressure line, which can suppress the stock price, DWN line is the support line, which can support the stock price, and BBIBOLL line is the central axis.

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The second question. See which is better.

Indicators have their specific uses. Different stocks have different indicators in different periods. If you look at the long line, you won't use KDJ. If you look at short lines, you won't use MACD. Active stocks cannot be viewed by indicators with small fluctuations. The indicator is not well marked. The key is the degree of application. Isn't Cheng's three-axe just three-axe? Others are still emperors.

Thank you.