a web application where users can create tasks, and able to add sub-tasks, set due dates, mark tasks as complete, and organize their to-do lists. This project involve database management, basic user authentication, and CRUD operations. database name: ToDoApp tables list: - users (id, username, password) - tasks (`user_id` int(11) NOT NULL, `task_id` int(11) AUTO_INCREMENT PRIMARY KEY, `task_name` varchar(255) NOT NULL, `parent_task_id` int(11) DEFAULT NULL, `due_date` date DEFAULT NULL, `status` int(2) NOT NULL DEFAULT 0)