GH: Tutorial – Basic Grasshopper Primer
Andy Payne, LIFT architects, has published a 150-page manual to help people get a basic understanding of Grasshopper. You can download the pdf and the source files from his website
www.liftarchitects.com
日本語にも翻訳されています。
Manual de Grasshopper – Versión Español
Manuale di Grasshopper – Versione italiana