This chapter covered some technology fundamentals you should know to get the most out of D3: SVG, which is the main standard used by D3 to draw graphics, ES2015 JavaScript used in all code examples (although D3 supports earlier versions as well), HTML Canvas and popular data formats.
In the next chapter, we will finally start diving deeper into D3 and create a bar chart using HTML and SVG, and also a world map, using a bit of most of the features we will cover in this book.