Answers for "target class [strudent] does not exist."

Target class does not exist.

use App\Http\Controllers\UserController;

Route::get('/users', [UserController::class, 'index']);
// or
Route::get('/users', 'App\Http\Controllers\UserController@index');

Target class does not exist.

use App\Http\Controllers\RegistrationController;

Route::get('/', [RegistrationController::class, 'create']);