There is this thing called the internet, it's filled with web servers. It's what cybersecurity is basically all about.

A web server is more than just a thing that serves up personal web pages. Virtually all system to system communication uses a web servers nowadays, the world runs on APIs.

I feel like this is like asking why you'd have to know how a stove works if you're going to be a cook. It's more than just related, it's practically the core most fundamental thing you need to know how it works in order to be a cybersecurity pentest person.

Imho attitude's like this really turn me off in some people. A friend of mine wanted to learn computer programming and information technology, so I gave him a crash course on docker with the goal of setting up a container to handle vpn bittorrent downloads. Really simple stuff, like copy and pasting a few commands. He asked why even do this if he can just use deluge on his desktop. Like, it's missing the forest for the trees, you need to know how stuff works to be useful to people that are looking to hire people who know how stuff works.

The friend of mine was hoping to work with me as a contractor so he could get high paid computer work, but frankly, I don't need to hire someone who is too lazy to learn even the most basic fundamentals. And in your case, knowing how a web server works is fundamentals. And you can figure out the basics in only a few days.

The only way you're going to make it in info tech is to be curious and figure out how stuff works. That is the *only* real skill you need to succeed.