For those, who skipper the first lesson, here´s a very useful textbook for the total basics. Download the .pdf and flip through it, so that you don´t get lost so often… (In such situations don´t hesitate to raise your hand and ask!) http://modelab.is/grasshopper-primer/
Original file:
02 - MESH - inputs
Website with plugins:
http://www.food4rhino.com/
Mesh Edit plugin:
MeshEdit
02 - MESH - deconstruct