Wordpress functions.php

How can I redirect users to the front page after log in? 

/* redirect users to front page after login */
function redirect_to_front_page() {
global $redirect_to;
if (!isset($_GET['redirect_to'])) {
$redirect_to = get_option('siteurl');
}
}
add_action('login_form', 'redirect_to_front_page');

Customize WordPress Logout URL

Add filter

Add this line to your theme ‘functions.php‘ file or to your plugin main file.

add_filter('logout_url', 'my_logout_url');

Add function

function my_logout_url( $logout_url, $redirect = null ) {
 return $logout_url . '&redirect_to=' . 'http://my-logout-page';
}