In this Grasshopper Tutorial you can learn how to model a parametric structure using the Kangaroo's Mesh relaxation method and explore essential mesh editing methods. Example File + Tutorial
In this Grasshopper Tutorial you can learn how to generate a 3d gyroid pattern between two Nurbs surfaces and control the number of the pattern in the u,v direction. Example File + Tutorial
In this Grasshopper tutorial for beginners you can learn how to find the solid difference between two sets of breps and then dispatch them into two set of surfaces. More info