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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery nth-of-type(1) demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    article { background: #f8fafc; padding: 12px; border-radius: 8px; }
    p { margin: 8px 0; padding: 8px; background: #fff; border: 1px solid #e2e8f0; border-radius: 4px; }
    p.lead { border-left: 4px solid #2563eb; font-weight: bold; }
    h3 { margin: 0 0 8px; }
  </style>
</head>
<body>
  <article>
    <h3>Section title (not a p)</h3>
    <p>First paragraph — matches nth-of-type(1)</p>
    <p>Second paragraph</p>
    <p>Third paragraph</p>
  </article>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("p:nth-of-type(1)").addClass("lead");
  </script>
</body>
</html>

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jQuery p:nth-of-type(1) — same as :first-of-type (Try It)