The Litt Auto Fib Tool automatically draws Fibonacci Retracements & Fibonacci Extensions based on time periods. The time period has two important settings.
1. The Fib Period is the period in which the Fib Tool determines a High and Low.
2. Use Previous Fib overlays the past periods Fib Levels on the current period.
For example, if we are using Daily period (D), then the Litt Auto Fib will calculate that Time periods High and Low. After determining the High and Low the tool will plot retracement levels and extension levels based off that Time periods High and Low. If we have the Use Previous Fib Unchecked it will use the current Day. If we have the Use Previous Fib checked (Or set to True), the Fib tool will use the previous day and overlay onto the current day. These levels can act as support and resistance, profit targets or stop losses. If you need more information on Fibonacci or how traders use it, it is best to do a quick Google search.