Basic "how-to" video on XYZ, distance, angle functions ?

 From:  Alomphega

I am still learning this amazing and brillant software, and I thank again Michael for this excellent tool he made for us.

But as a real beginner I have to say some functions like sizing objects sounds strange for me, and I do not understand clearly while reading the manual how it can work (or at least if it can do what I think).

Is there somewhere any video tutorial showing the basics of how to use the "XYZ, distance, angle" boxes ?
Or/and how to (re)sizing (with exact measurement) an already drawn item ?

Thank you very much for your time answering to me,
Best Regards,

Guy Capra,
always working on few funny projects : ; and so on...