Type: Volatility + Reversal | Best for: identifying price extremes Bollinger Bands are 3 lines: a middle average and two bands (upper and lower) that expand and contract with volatility. Price touches the upper band → it's "stretched" → it may come back → consider SELLING Price touches the lower band → it's "stretched" → it may come back → consider BUYING Very tight bands → low volatility → get ready for a strong move Recommended setting: period 20, deviation 2 (default). Be careful: Bollinge