Custom Login Page Wordpress

[admin]

I am trying to create a custom login page template for my Wordpress website so I have used the code from codex (<a href="https://codex.wordpress.org/Customizing_the_Login_Form" rel="nofollow noreferrer">https://codex.wordpress.org/Customizing_the_Login_Form</a>) but I don't know how to change the redirect when the user put wrong username or password. It sends the user to the default wp-login page.
How can I redirect the user to my custom login page but with an error message?

P.S.: I am a self-taught coder and I know almost nothing about PHP.

<?php  
/** 
 * Template Name: login page 
 */  
?> 

<?php get_header(); ?> 


<?php
    if ( ! is_user_logged_in() ) { // Display WordPress login form:
        $args = array(
            'redirect' => admin_url(),
            'form_id' => 'student-loginform',
            'label_username' => __( 'Username' ),
            'label_password' => __( 'Password' ),
            'label_remember' => __( 'Lembrar-me' ),
            'label_log_in' => __( 'Log In' ),
            'remember' => true,
            'echo' => true,
    );

    wp_login_form( $args );



    } else { // If logged in:
        wp_loginout( home_url() ); // Display "Log Out" link.
        echo " ";
    }
?>  




<?php get_footer(); ?>