Quote from IronFist:
Fibs are one of those things like Trendlines. In hindsight you can make them look awesome. But I never know where to begin or end them in order to get the correct retracements.
And honestly, the rational part of me wants to say it's voodoo BS... but since they appear to be mentioned in that book by Suri that everyone keeps recommending, I will try to keep an open mind.
You shouldn't look at trend lines as support or resistance. If you view them as a measure of the trend, then you will eliminate this voodoo mindset. Grab a chart and find a low and connect it to a higher low after a higher high has formed. From there monitor price in reference to that trendline. Is price moving far away from the trendline(increased momentum)? Is price consistently breaching the trendline(buyers losing momentum)? After a trendline break, we can infer that the trend is losing steam. Now until we see a lower high and a lower low, the uptrend is just pausing.