See scottmurray.org for the latest, including a new book project. This website is not current and will be retired at some point.
These tutorials address an older version of D3 (3.x). See my book Interactive Data Visualization for the Web, 2nd Ed. to learn all about the current version of D3 (4.x).
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These tutorials have been generously translated to Catalan (Català) by Joan Prim, Chinese (简体中文) by Wentao Wang, French (Français) by Sylvain Kieffer, Japanese (日本語版) by Hideharu Sakai, Russian (русский) by Sergey Ivanov, and Spanish (Español) by Gabriel Coch.