How To Install tutorial confusing instruction re: creating virtual host your_domain

Hello and thank you for the tutorial on how to create a virtual host in Ubuntu. Unfortunately this sentence causes confusion:

When using the Apache web server, you can create virtual hosts (similar to server blocks in Nginx) to encapsulate configuration details and host more than one domain from a single server. In this guide, we’ll set up a domain called your_domain, but you should replace this with your own domain name.

The instruction are good for explaining that users may need to host more than one domain, yet, when proceding further, the instructions are suggesting to include “your own domain name”. What happened to the idea that more than one domain may find it’s home here??? Now I don’t know if I’m supposed to consider what I’m entering as the data for just one domain, or multiple domains? Totally confusing. As a result, the rest of the steps don’t work for me because they are asking me to enter my domain (as in single domain) even though I was planning on hosting several domains. . .