PHP to Begginers. Dont working About and Contack page

I didnt found departament for php so i writing it here. The problem is that:

1. I have cloned repository for PHP for begginers through git clone
2. git checkout fb07ea5
3. i have cloned it to htdocs on xampp. i use windows11
4. i have opened index.php it shows me "array(2) { [0]=> array(2) { ["id"]=> int(1) ["name"]=> string(2) "xD" } [1]=> array(2) { ["id"]=> int(2) ["name"]=> string(2) ":D" } }" 4.1) i have commented "dd($posts);" and uncommented "require 'router.php';"
5. when i clicled "Home" it sends me to "http://localhost/dashboard/" thats is Xampp page but when i clicking about or contack it shows me "Not Found The requested URL was not found on this server.

Apache/2.4.58 (Win64) OpenSSL/3.1.3 PHP/8.2.12 Server at localhost Port 80"

6)my fix for that was in router.php "$routes = [ '/PHP-For-Beginners-Series/' => 'controllers/index.php', 'PHP-For-Beginners-Series/about' => 'controllers/about.php', '/PHP-For-Beginners-Series/contact' => 'controllers/contact.php', ];" and in views/partials/nav.php on line 9 to 14

                    href="/PHP-For-Beginners-Series/" class="<?= urlIs('/') ? 'bg-gray-900 text-white' : 'text-gray-300' hover:bg-gray-700 px-3 py-2 rounded-md text-sm font-medium">Home
                    href="/PHP-For-Beginners-Series/about" class="<?= urlIs('/about') ? 'bg-gray-900 text-white' : 'text-gray-300' ?> hover:bg-gray-700 hover:text-white px-3 py-2 rounded-md text-sm font-medium">About
                     href="/PHP-For-Beginners-Series/contact" class="<?= urlIs('/contact') ? 'bg-gray-900 text-white' : 'text-gray-300' ?> hover:bg-gray-700 hover:text-white px-3 py-2 rounded-md text-sm font-medium">Contact
                "

and Home works just fine but About and Concact does not work and shows me "Not Found The requested URL was not found on this server.

Apache/2.4.58 (Win64) OpenSSL/3.1.3 PHP/8.2.12 Server at localhost Port 80"

Any one knows how to fix that?

If it is wrong departamend please tell what departamend is ok for this question.