The FIBs retracement's is a chart overlay tool used for Chart Analysis..
You can find it at stockcharts.com for every chart you pull up, by clicking the annotate flash link, at the bottom of all charts. Once the new chart comes up. Click the horizontal lines box at the top of the new chart look. Then click and hold at the new runs breakout start point on the chart and drag to the top candle body and release, at the right chart border. You'll see the overlay, like in the chart I posted.
Fibonacci Retracements is a mathematical formula hundreds of years old. That works very well for evaluation of stock retraces. A great tool not always used by beginners, as it doesn't show up as a TA overlay indicator, in most cases.
IMO Knowing how it works doesn't matter. Just use it to evaluate re-entry possibilities after taking profits. With My rule of thumb.
We're adding tools to a traders basket. FIBs is important for that bag.
I'm here to teach, so one can do TA & chart evaluations on their own. Time to start learning, as I will not continue to give step by step instruction of ones personal play forever.
Like the saying; I don't want to feed the fishermen, but teach him to feed himself. I don't understand charts will not be an excuse for ever. Unless there is an effort seen to learn.
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