This example demonstrates the minimal setup required to begin using D3 version 7 in a web page. It renders the text “Hello D3 version 7” in the center of the viewport using a 13-em font size. The page loads D3 from a CDN and uses the `select` API to target the body element, then applies the text content. The code includes an embedded video tutorial explaining how to start with D3 version 6, highlighting the transition between versions.