See https://beta.observablehq.com/@mbostock/five-minute-introduction https://beta.observablehq.com/@mbostock/five-minute-introduc... and the links therein, e.g.

See https://beta.observablehq.com/@mbostock/five-minute-introduction https://beta.observablehq.com/@mbostock/five-minute-introduc... and the links therein, e.g. the video they made https://www.youtube.com/watch?v=uEmDwflQ3xE https://www.youtube.com/watch?v=uEmDwflQ3xE