Config Help

Hi guys, i have a simple question..
How can i get and set "test" from config.yml
I can only get "Name" I do not know how to get the value x: "test"

$config = new Config($this->getDataFolder() . "/config.yml", Config::YAML);
$name = $config->get("name");

PHP:

Name:
 x: test
 y: aaaa
 z: bbbb

P.s: sorry for noob english

 

I might be mistaken; but, I believe it is..

PHP:

$x = $config->get("Name")["x"];

 

PHP:

// getter
$x = $config->getNested("Name.x", "default");

//setter
$config->setNested("Name.x", $x);