Good tutorial on how to code a URL Shortener

I would like to create a URL Shortener which can be hosted on a Shared Hosting Server (preferably without Nodejs because the Shared Hosting I use doesn't support Nodejs directly).

I've tried some tutorials, but either they don't work with my hosting, only work manually (via commands in the shell), were not easy enough to understand for me or incomplete.

The Tutorials I tried:

• https://dev.to/commonshost/build-your-own-url-shortener-in-15-minutes-279n
• https://www.freecodecamp.org/news/building-a-simple-url-shortener-with-just-html-and-javascript-6ea1ecda308c/ (Didn't understand this one because I'm new to HTML, CSS, and Javascript)

I'd like to have a Website which has an input and a button. After you input a valid URL it should check the URL with the VirusTotal API and if that's ok, create a short URL and display it.

Thanks in advance!