The section Working with Web Services belongs to Linux Fundamentals module.
Download the VPN file from HTB Academy and run the following command in the same directory:
sudo openvpn academy-regular.ovpn # Make sure you have openvpn installed.
The npm package is required if you actually want to run the HTTP server (the target machine doesn't allow that), but the command used is:
http-server -p 8080
Starting a local php server is as simple as:
php -S 127.0.0.1:8080