I found this on investopedia: The most significant Fibonacci retracement level to watch for is the 0.618. This is the inverse of the golden ratio, 1.618 or phi. The 0.618 retracement level tends to be the maximum pullback zone where fear climaxes as the final sellers throw in the towel and bargain hunters rush into the stock to resume the uptrend. On downtrends, the 0.618 price level should be where the final buyers are exhausted as sellers take the opportunity to unload their positions and short-sellers jump off the fence to push down the price and resume the downtrend. Some traders prefer to wait for two to three candlestick closes above or below a Fibonacci retracement level to confirm support or resistance before placing a trade.