curve- , Bref- tutorial

Hi

I'm looking for a tutorial especially about curve modelling, because I think there must be more things posssible, than taking curves directly from rhino.
I'm very new in grasshopper and it would great to take a look on how a professionals work with realistic design-products, built out of parametric curves manipulated with grasshopper. And with following surfaces, which depend on each other, and are all together at the end a closed BRef. (like in solidworks)

As I told, I'm very new in Grasshopper, but nevertheless I want to ask something even it is ... ;-) ,
Is it right, that perhaps in grasshopper you work in annother way or phylosophy with curves and surfaces than in rhino ? ... perhaps more in a way like with meshes ??
Or can you also build a surface based on other surfaces with a tangential connection.

Perhaps someone know some good tutorials.

thanks for all

greetings from berlin

carsten