WP Logout link

I have been playing with WordPress recently, and of course faced some challenges.
One of them is having a simple link to logout WordPress, just like login
for login, you can easily link to…
/wp-login.php
For register, you do
/wp-login.php?action=register
But that is not as simple if you want to logout, you need to pass another argument (called _wpnonce) which looks like a session ID that is changed every login.
That makes it almost impossible to allow logging out using a simple link, unless you install some plugins.
So after some playing, I was actually able to do that by adding new php file.
I called wp-logout.php and placed it in my website root.
This way, I can call it anywhere I want to logout the current user
Either download attached or use code below

Resource1: https://wpbeaches.com/create-loginlogout-link-wordpress/
Resource2: http://wpgpl.com/wordpress-tricks/how-to-add-a-loginlogout-link-to-your-navigation-menu/