Need help here forum, am stuck here, dont really understand this svg that much

Tell us what’s happening:

Your code so far


<body>
<script>
  const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];

  const w = 500;
  const h = 100;

  const svg = d3.select("body")
                .append("svg")
                .attr("width", w)
                .attr("height", h);

  svg.selectAll("rect")
     .data(dataset)
     .enter()
     .append("rect")
     .attr("x", (d, i) => i * 30)
     .attr("y", (d, i) => h - 3 * d)
     .attr("width", 25)
     .attr("height", (d, i) => 3 * d)
     .attr("fill", "navy");

  svg.selectAll("text")
     .data(dataset)
     .enter()
     // Add your code below this line
     .append("svg")
     .text(dataset, (d)=> d)



     // Add your code above this line
</script>
<body>

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