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I've taught #D3js to nearly 300 faculty, staff, and students at primarily the grad/PhD level across various workshops and bootcamps.
Some key reasons behind why D3 is hard, I'll outline below (in case anyone is learning or curious)
I've taught #D3js to nearly 300 faculty, staff, and students at primarily the grad/PhD level across various workshops and bootcamps.
Some key reasons behind why D3 is hard, I'll outline below (in case anyone is learning or curious)
While you DO need to understand empathy, design, color perception, visual cognition, story-telling, geometric thinking, graphical conventions, basic statistics, data structures, linear/spatial algebra, and trigonometry to do VISUALIZATION well, D3 makes all of this *EVEN HARDER* 
Why? Because the CORE of D3 is in its name: 'Data Driven Documents.' Data-driven is one thing, but the 'Documents' part refers to the DOM, which is a broad term referring to the *stuff* that makes up the web:
HTML
CSS
SVG/XML
Canvas
JavaScript
& more - all at once
HTML
CSS
SVG/XML
Canvas
JavaScript
& more - all at once
