How to Hide WordPress login page without plugin

Hide WordPress login page without plugin. This is a simple way to prevent User access your WordPress default login page.  Some times you need to prevent your site users to access your admin section.
The action Hook “ login_init ” helps you to run a snippet before loading login page.  So the follwoing code help you to redirect the login page to 404 page.  I mean page not found error page.

function kv_no_loginpage_access() { 
 global $wp_query;
 $wp_query->set_404();
 status_header( 404 );
 get_template_part( 404 ); 
 exit();
} 
add_action( 'login_init' , 'kv_no_loginpage_access' ); 
add_action( 'admin_init' , 'kv_no_loginpage_access' );

So making your WordPress hard to prevent user access. Instead of the 404
 page. you can redirect them to  a custom login page to get some front 
end your rights. May be you have premium things.  which you want to show
 it to the premium subscribers.

function kv_no_loginpage_access() { 
 get_template_part( 'custom-login-page' ); 
 exit();
}