Email notification 
C:\wamp\www\appointment3\application\libraries\notifications.php
C:\wamp\www\appointment3\application\config\config.php
C:\wamp\www\appointment3\index.php
C:\wamp\www\appointment3\application\controllers\appointments.php
C:\wamp\www\appointment3\application\controllers\backend.php
C:\wamp\www\appointment3\application\views\backend\settings.php
C:\wamp\www\appointment3\application\views\appointments\book.php
C:\wamp\www\appointment3\application\helpers\installation_helper.php

How to install WAMP Server on Windows
https://www.youtube.com/watch?v=kVc_9vAO7oI

How to use dreamweaver
https://www.youtube.com/watch?v=D-5xpY4zH2c

Object Oriented Programming (OOP) for Beginners in PHP
https://www.youtube.com/watch?v=w3XUG6oyINI
&
https://www.youtube.com/watch?v=5YaF8xTmxs4

The difference between procedural and object-oriented programming
https://www.youtube.com/watch?v=OEfSFrk_KEI

Advantages of Using Object Oriented Programming Part 1
https://www.youtube.com/watch?v=wNQmfOUuAAk

Object Oriented Programming
https://www.youtube.com/watch?v=SZqLEDH0x7A