Bollinger Bands are popular with many traders.
Bollinger Bands is a volatility indicator similar to the Keltner Channel.
When the bands widen, it is an indication of high volatility in the market.
When the bands narrow down, it is an indication of low volatility in the market.
Read this post in which I have posted videos that explain how not to trade with Bollinger Bands.
Combining candlestick patterns with Bollinger Bands can be a good idea.
I use candlestick patterns a lot in my trading.
By combining bollinger bands with candlestick patterns you can develop a winning trading system.