This article explains how to create CRUD operations in PHP using MySql and Bootstrap 4.To start with, create a table in the database called 'usuario'.The article then provides instructions on how to configure the 'Conexao.php' file inside the 'app/conexao' folder.The article provides the code for connecting to MySql and PostgreSql databases.A sample code for the 'index.php' file is provided which has the form for inserting new users and displaying the list of users.The 'Usuario.php' and 'UsuarioDAO.php' files are used to get and set the user details, and to perform CRUD operations.Lastly, the 'UsuarioController.php' file is used for handling the requests from the view and performing CRUD operations accordingly.This article serves as a good starting point for anyone looking to create a simple CRUD application in PHP using MySql and Bootstrap 4.The code is concise and well-explained, making it easy for beginners to follow along.Overall, this article does a great job of explaining how to create a simple CRUD application in PHP using MySql and Bootstrap 4.