Hello, @DavidDeb
LOL, no, we love trying to help.
Ok, the curves are quite complicated to actually explain and there are various topics on the subject, like this one: Creating Smooth Curves: The Kolson Method.
However, your curve is a little different 
Here is my ‘little different’ effort to assist you:
I’ve put in 2 additional points between the main points (A1 to A5) which I used in creating the curve using the Spline - Fixed tool. I’ve tried to reference the lines between the main points to get an angle for these lines.
The reason why I used this method is because I don’t need to go into the curves properties to edit the length and angle of the curve handles, I can click on the label & edit them in the Property Editor. Which makes life much easier in this instance, and the extra points can be hidden in a group of their own later, if you don’t want to see them.
Here is my test pattern, have a look and see if it will help you:
Curve Example.sm2d (4.1 KB)