Looking for training pdf for grasshopper

I have been using Rhino5 quite a bit, but nowhere near where I’d like to be. But I have found the Level 1 training pdf and models extraordinarily helpful. Now I am evaluating Rhino6 and trying to get a handle on Grasshopper. I’ve done lots of C++ programming. I’ve done a little Python. I’m hoping someone can point me to some training material on Grasshopper. I’ve watched a couple of the videos but I’d like more instruction.

There are a number of courses online. There are also the older Primers on the learn page: http://www.grasshopper3d.com/page/tutorials-1

The old Primer at the bottom of the page is a classic.

Thank you so much, Scott. Exactly what I was looking for.