Yes, Bollinger Bands are reliable. Bollinger Bands are a technical analysis tool that consists of three lines drawn on a chart. The middle line represents the moving average of the asset's price, while the upper and lower lines represent the standard deviation of the price over a certain period of time.
The distance between the upper and lower lines is determined by the level of volatility in the market. When the market is more volatile, the distance between the lines is greater, and when the market is less volatile, the distance between the lines is smaller.
Bollinger Bands can be used to trade trends, and top and bottom reversals.
To use Bollinger Bands to trade tops and bottoms effectively, binary traders identify the upper line, and lower line on a chart, and then trade a lower binary contract at a touch of upper line, and trade a higher binary contract at a touch of upper line.