Reading series
D3.js Fundamentals
2 parts, in reading order.
data visualizationD3.js Join Semantics - A Conceptual Look
Understand D3.js data joins by mapping data to DOM elements and working through enter, update, and exit selections.
data visualizationD3.js Creating a Bar Chart from Ground Up
Build a D3.js bar chart from first principles using SVG, scales, axes, margins, and data joins.