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<!DOCTYPE html>



<html lang="en">



<head>



  <meta charset="utf-8">



  <title>td:first-of-type column</title>



  <style>



    body { font-family: sans-serif; padding: 16px; }



    table { border-collapse: collapse; width: 100%; max-width: 24rem; }



    td, th { border: 1px solid #cbd5e1; padding: 8px 12px; text-align: left; }



  </style>



</head>



<body>



  <table>



    <tr><th>Name</th><th>Age</th><th>City</th></tr>



    <tr><td>Ada</td><td>36</td><td>London</td></tr>



    <tr><td>Ben</td><td>28</td><td>Berlin</td></tr>



  </table>



  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>



  <script>



    $("tr td:first-of-type").css({



      backgroundColor: "#f1f5f9",



      fontWeight: "bold"



    });



  </script>



</body>



</html>

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tr td:first-of-type — table column (Try It)