I have been doing the grasshopper tutorials on t, but quite a few of them are a little outdated (for instance, some require T-splines, which is not available anymore). I also found some of the tutorials lacking in the sense that they often don’t explain why they’re doing things in a certain way, you just follow along and eventually something cool pops out.
Is there a really good book or course or set of tutorials that teach you Grasshopper really well?