To Successfully Trade You Should Understand - Fibonacci Retracement Tool
Fibonacci retracements give a trader a heads up to prices where a retracement should return to its current price trend. This tool is easy to use and can be helpful finding entry and exit points, setting stop losses.

Fibonacci Retracements are ratios used to identify potential reversal levels. These ratios are found in the Fibonacci sequence. The most popular Fibonacci Retracements are 61.8% and 38.2%. Note that 38.2% is often rounded to 38% and 61.8 is rounded to 62%. After an advance, chartists apply Fibonacci ratios to define retracement levels and forecast the extent of a correction or pullback.