Having gone through 110 of 129 of Paramarch’s Grasshopper Tutorials, I found them to very helpful for learning Grasshopper.
There are 22 hours, 59 minutes and 57 seconds of Grasshopper videos here. I think that you should watch some basic videos before beginning the series.
There are a few places where he proceeds off camera for the class, or minor changes happen in the layout of components, which can be daunting, but I feel that I’ve learned a lot from the series.
Thank you : )
[I’ve forgone the Photoshop tutorials because I am comfortable with it, the Maxwell ones because I don’t have Maxwell, and the Illustrator ones because I would rather use Inkscape but that’s a personal preference.]