Answer 1

You can go through these links here given with sweet and simple example.

https://www.google.com/amp/s/www.cloudways.com/blog/custom-php-mysql-contact-form/amp/

https://www.tutorialrepublic.com/php-tutorial/php-mysql-insert-query.php

http://people.cs.ksu.edu/~hankley/d764/tut06/GopisettyPHP.html