Basically there are two Bollinger Bands:
1. 20 Period, 1 Standard Deviation
2. 20 Period, 2 Standard Deviation
Red candle means break lower channel.
Green candle means break upper channel.
1. 20 Period, 1 Standard Deviation
2. 20 Period, 2 Standard Deviation
Red candle means break lower channel.
Green candle means break upper channel.