Michael M. answered 10/30/21
WordPress Tutor For Hire
In your <form action="#" method="post"> replace the # with the url of a form processing end point that reads the POST data and dose CRUD actions with it.
Research PHP as a starting point to process your POST data.(There are many other scripting and programming languares you can use but PHP is a good starting point.)
For example your # could be replaced with "processform.php" on your server and processform.php will process your forms data.
Many examples exist to help you construct your php form processing functions.
Once your form processor has captuered the POST data then you must connect php to a DataBase like MySql. because it is the DB that saves your form POST data so it can be read back into other parts of your php programs and passed to your HTML for rendering to the user.