How to Run Web Dev Project Online on a Server with VSCode?

Hi,

I'm following this tutorial on making a translator with HTML/CSS/JS/PHP and I notice the person is using Apache XAMPP to run the program. First, I tried running my code with Live Server but I realized it isn't suited to run this kind of program (same thing with "open in default browser" option). I kept getting a

POST http://127.0.0.1:5500/process.php 405 (Method Not Allowed) error

with Live Server; however, I'm expecting "Hello Everyone." to print on console (from 13:14 to 13:39 in video).

If it helps, here's my files so far -

• assets
  • js
    • app.js
    • jquery.min.js (downloaded into project)
  • css
    • style.css (empty)
    • tailwind.min.css (downloaded into project)

index.html
process.php (only contains the text "hello everyone.")

Because of the 405 error, I tried downloading XAMPP but ran into some issues and then decided to look for alternatives. So far I came across one called Community Server Connectors but I'm not exactly sure how I'd use it and if it works with web dev programs.

How would I run the program without XAMPP? Are there any options that can run my program without errors, just like in the video? Thanks!