[Help] how to make a permission node not for commands? But for checking

I checked with many popular plugins that they always have a permission not for commands just for checking if you have the permission of something.

For example I want the server to check if the player have the permission of [kill.bypass] so then that the player will not get killed but every other player that don't have that permission.. like do I just use this?

Code:

if(player.hasPermission("kill.bypass")){
    //code here
}

but do I have to register the permission in plugin.yml too? since its not a command? but if I need to register it in the plugin.yml, whats the format of it?

Thank you!

 

You just do literally that? Permissions don't have to be registered in plugin.yml

 

hintss
it doesn't seems to be working..

 

and the code?