Exercise: Using Fibonacci Retracement and Fibonacci Extension

Throughout this exercise I found that there are inconsistencies between what is called the Fibonacci Projection and the Fibonacci Extension.
I also found that there are two ways that Fibonacci Extensions are plotted, and they are not inclusive.

the first way taking measure taking take into account the following points:
1) The beginning of the impulse (A)
2) The end of the impulse (B)
3) The end of the recoil (C)

the second way taking keep these points in mind:
1) The beginning of the impulse (A)
2) The end of the impulse (B)
2) Go up to the beginning of the impulse (A)