One more image for @Lotfi_Leviaton before I get on with Dinner 
and the VAT return 
It’s not obvious but while in Sketch mode you can still rotate the view around, resize/reshape the sketch and see the changes to the model as you go. It’s why I think some simple tasks are better in FreeCAD than OpenSCAD, you can get immediate feedback, not have to adjust-render, adjust-render. But there are some complex shape’s you’d be mad to try in FreeCAD instead of OpenSCAD. It’s just a matter of the right tool for the job at hand, just as most people wouldn’t put screws in with a hammer.
The must important thing is the end result " the screws went into the hole why not with a hammer" 
i’m kidding .
Bear in mind it’s been only two weeks or a mount i’ve been using freecad all tips are welcome
Thanks
When I wrote “most” I did think of my father, he’s been known to pick up the odd screw when out of nails and hammer it in, smiling and saying “French nails”.
@Mark_MARKSE_Emery
why frensh nails ?
and what about you can import and/or create a OpensCad code inside FreeCad? that joins the immediate feedback giving by FreeCad with the capable more complexity you can easy get in OpensCad, please correct me if I’m wrong
You can add OpenSCAD in the module, then click ADD. Unless I’m doing something wrong there’s no easy way to tweak the code and update. Would be very happy to be proved wrong. A FreeCAD/OpenSCAD hybrid where you could select a line and say ‘Call this length X’, so it can be referenced elsewhere as =X*2 rather than a fixed number would be very useful. E.g Pad to half the length. Pocket to 0.75 times the depth.
It’s funny that you would say “there are some complex shapes you’d be mad to try in FreeCAD than OpenSCAD”, for me it’s the other way around, unless we’re talking about Sikowski transforms or whatever they are called. You can’t do lofts or sweeps in OpenSCAD.
As for your last comment, this is called “global variables”, it’s planned but there is no schedule set.