Many of mbostock's recent "blocks" use D3 v4 http://bl.ocks.org/mbostock http://bl.ocks.org/mbostock These are not tutorials, but working examples with some in

Many of mbostock's recent "blocks" use D3 v4 http://bl.ocks.org/mbostock http://bl.ocks.org/mbostock These are not tutorials, but working examples with some introductory texts. They are very helpful for diving into D3.