JQuery
  1. jQuery is a Javascript support library.
  2. Use by simply sourcing the file.
    1. You can use the one from jQuery at
      <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
      Or maybe just copy it from there.
    2. Or use ours:
      <script src="https://sandbox.mc.edu/jquery/jquery-3.7.0.min.js"></script>
      (which seems to be one minor version old just now).
    3. The min section of the file name refers to a version with the spaces and comments removed for faster transmission. If you want a human-readable version, try without the min.