This example introduces the fundamentals of D3 version 7 by rendering a simple text message directly into the body of an HTML page. It demonstrates the basic setup of an SVG-less D3 project, where the code imports the `select` function from the D3 library and uses it to target the `<body>` element. The example then sets the text content of that element to display the phrase "Hello D3 - This is just the beginning", showcasing data binding and DOM manipulation with a minimal, plain-text approach rather than a visual chart.