How to make my own loging page

Hello
I am following a tutorial to have tis own login page.

if you look at the minute 2.19, he enter https://82.241.58.241/Wordpress/login and he get a page.
On my server, if I enter https://www.myserver.ch/login, I got an error page.

That tutorial is a bit old and may be is due to WP version, but with last version, is possible to have page/folder login?

In the /wp-content/themes/twentyseventeen_perso/function.php file, I also added the follwing line

// Add by pamey
add_action('send_headers','site_router');
function site_router(){
	$root = str_replace('index.php','',$_SERVER['SCRIPT_NAME']);
//	print_r($root);
	$url = str_replace($root,'',$_SERVER['REQUEST_URI']);
//	print_r($url);
	$url = explode("/",$url);
//	print_r($url);
	if(count($url) == 1 && $url[0] == 'login')
	{
		echo "LOGIN";
		require 'tpl-login.php';
	}
}

In that way, when I enter https://www.myserver.ch/login, it redirect to my tp-login.php template.

No my problem is that https://www.myserver.ch/login return me an error, instead of a page… ??