What are the steps to learning how to turn my laptop into Nextcloud server?

I have an extra laptop with 8gb or ram that I want to turn into my Nextcloud server.

The steps that I think I need to take:

1. Learn how to set up a server on a laptop.
2. Learn how to install Nextcloud software on the server.

But I'm confused because I came across a video where someone set up Nexcloud right on their Windows laptop. Does that mean I can do that on my Ubuntu laptop?