PHP CRUD allows you to create, read, update, and delete
                                records from your database. With CRUD you can create pages to list and edit your
                                records. 
                                MySQLi is an extension used in PHP to communicate with databases. It offers many
                                benefits (over MySQL) including being more secure and taking advantage of an object
                                oriented interface. This is a great and practical way to learn database
                                communication and object oriented programming techniques with PHP. 
                                Combining both CRUD and MySQLi will move you on your way to becoming a good and
                                practical PHP programmer.