Learn Grasshopper through these video series with the creator of Grasshopper, David Rutten.
Getting Started with Grasshopper:
This 13-video series shows the fundamentals of Grasshopper: the interface, the canvas and the basic knowledge to create your first definitions.
Data Trees Masterclass:
This 6-video series shows one of the key concepts of Grasshopper, data trees. This series describes what data trees are and shows some typical ways to manipulate and use the data tree structures within your definitions.