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If there are some else directory in Controllers directory like Backend, Api or something else, you can define routes as following:

$router->get('/create', 'Backend.IndexController@create');
$router->post('/store', 'Backend.IndexController@store');
# OR 

$router->get('/create', 'Backend\\IndexController@create');
$router->post('/store', 'Backend\\IndexController@store');
# OR

$router->get('/create', [Backend\IndexController::class, 'create']);
$router->post('/store', [Backend\IndexController::class, 'store']);