HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>td first-child column</title>

  <style>

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

    table { border-collapse: collapse; width: 100%; }

    td { border: 1px solid #ccc; padding: 8px; }

  </style>

</head>

<body>

  <table>

    <tr><td>Name</td><td>Age</td><td>City</td></tr>

    <tr><td>Ada</td><td>28</td><td>London</td></tr>

    <tr><td>Ben</td><td>34</td><td>Paris</td></tr>

  </table>

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

  <script>

    $("tr td:first-child").css({ backgroundColor: "#f1f5f9", fontWeight: "bold" });

  </script>

</body>

</html>

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First column cells td:first-child (Try It)