How to include PHP in a HTML (CSS,JS) website?

So I need to make a contact form for my website with PHP. Why PHP? My dad said that our webhost only works with PHP and not Node.js or something else.

So I downloaded XAMPP and started the Apache server, googled localhost:80 and my website was shown. All good. I added the directory of my HTML, CSS, JS files to DocumentRoot and Directory in httpd.conf. Was that the right thing?

Then I looked at how to integrate PHP with Apache. Then I found out that I have to add this in httpd.conf.

LoadModule php_module "c:/php/php8apache2_4.dll"
<FilesMatch \.php$>
    SetHandler application/x-httpd-php
</FilesMatch>
PHPIniDir "C:/php"

But that didnt work for me because I couldnt start my apache server anymore.

The error log said that something was wrong in apache/htdocs/api.

I tried to find this directory and couldnt find api in htdocs. So now Im kinda overwhelmed.

Does anyone know what to do?

Solution

If you download XAMPP then it's already set up with php. You don't have to install php manually.