Help with the D3 projects?

Hey all. I’m having a lot of trouble with the D3 projects. The Bar chart and Scatterplot graph were tough, but with curriculum knowledge they were doable. But Choreopleth (USA map), Tree Map (video games), these are very far outside of the scope.

How have others completed them? Are there any good videos out there that cover it? Or did you take a different course? I find the D3 stuff really frustrating.