Updating Oracle database using AJAX

I have created a project where my interface fetch data from my Oracle SQL database using springboot, Jquery and AJAX and displays it on a table. What I couldn’t find online is to how to do basic operations(Post, Delete) on my table using HTML forms. All sources mostly focuses on php mySQL projects. I would appreciate any help or guidance on this matter.

$(function(){ //fetching data from oracle

    var $patientsfn = $('#firstname');
    var $patientsln = $('#lastname');
    var $patientsno = $('#patientno');
    var $patientsage = $('#age');
    var $patientsg = $('#gender');
    var $patientsad = $('#adresses');
    var $patientsrd = $('#registerdate');
    var $patientsadd = $('#attendeddoctors');
    $.ajax({
        type: 'GET',
        url: 'http://localhost:8080/api/v1/patients',
        success: function(patients) {
            $.each(patients, function(i, patient){
                $patientsfn.append('<li>'+ patient.firstNames+ '</li>');
                $patientsln.append('<li>'+ patient.lastName+ '</li>');
                $patientsno.append('<li>'+ patient.patientNo+ '</li>');
                $patientsage.append('<li>'+ patient.ages+ '</li>');
                $patientsg.append('<li>'+ patient.genders+ '</li>');
                $patientsad.append('<li>'+ patient.adresses+ '</li>');
                $patientsrd.append('<li>'+ patient.registerDate+ '</li>');
                $patientsadd.append('<li>'+ patient.attendedDocs+ '</li>')
            })
        }
    });
    function submitData(){
        var submitfn = $('input[submitfn = firstNames]').val();
    }
    
});
<script <!-- code for table and  --> src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<a href="backup.html" class="btn btn-secondary text-light">add data</a>
    <div class="container">
      <table id="example" class="table table-striped" style="width: 100%">
        <thead>
          <tr>
            <th>FIRSTNAME</th>
            <th>LASTNAME</th>
            <th>PATIENTNO</th>
            <th>AGE</th>
            <th>GENDER</th>
            <th>ADRESSES</th>
            <th>REGISTERDATE</th>
            <th>ATTENDEDDOCTORS</th>
          </tr>
        </thead>
        <tbody>
          <tr>
            <td id="firstname"></td>
            <td id="lastname"></td>
            <td id="patientno"></td>
            <td id="age"></td>
            <td id="gender"></td>
            <td id="adresses"></td>
            <td id="registerdate"></td>
            <td id="attendeddoctors"></td>
          </tr>
        </tbody>
        <tfoot>
          <tr>
            <th>FIRSTNAME</th>
            <th>LASTNAME</th>
            <th>PATIENTNO</th>
            <th>AGE</th>
            <th>GENDER</th>
            <th>ADRESSES</th>
            <th>REGISTERDATE</th>
            <th>ATTENDEDDOCTORS</th>
          </tr>
        </tfoot>
      </table>
    </div>
    
    
    <body id="second">
    <h1 id="header">Veri ekleme</h1>
    <img id="backupimg" src="images/akgun.png" alt="" />


    <form> <!--code for html form-->
      <label for="firstNames">First name:</label><br />
      <input type="text" id="firstNames" name="firstNames" /><br />
      <label for="lastName">Last name:</label><br />
      <input type="text" id="lastName" name="lastName" /><br /><br />
      <label for="ages">Age:</label><br />
      <input type="text" id="ages" name="ages" /><br /><br />
      <label for="genders">Gender:</label><br />
      <input type="text" id="genders" name="genders" /><br /><br />
      <label for="adresses">Adress:</label><br />
      <input type="text" id="adresses" name="adresses" /><br /><br />
      <label for="attendedDocs">Attended Doctor:</label><br />
      <input type="text" id="attendedDocs" name="attendedDocs" /><br /><br />
      <label for="registerDate">Register Date:</label><br />
      <input type="date" id="registerDate" name="registerDate" /><br /><br />
      <input id="submit" type="submit" />
    </form>