problem with form data

What should you do is to define all routes you need.
If you don't define the route, you cannot access to the controller method.

And each HTTP request needs a HTTP method (HTTP verb).
Each route also needs a HTTP method (HTTP verb).

You can see your all routes with `php spark routes` command.
https://codeigniter4.github.io/CodeIgnit...ing-routes

You should try the News tutorial:
https://codeigniter4.github.io/CodeIgnit...index.html

Sir, I tried the News Tutorial already but still i don't get any data on my controller.

helper('form');
$data = $this->request->getPost();

print_r($data);

Route

$routes->match(['get', 'post'], 'rules', [Appointment::class, 'rules']);
$routes->match(['get', 'post'], 'appointment', [Appointment::class, 'appointmentForm']);