How to Use Raspberry Pi Desktop Without a Monitor
Zhaoolee has started a long series on GitHub titled "Raspberry Pi Doesn't Gather Dust" https://github.com/zhaoolee/pi. It has currently been updated to 18 articles, mainly focused on using Raspberry Pi to install Ubuntu as a home server.
Coincidentally, I have an idle Raspberry Pi 4B on hand, and I plan to deeply explore the Raspberry Pi desktop version, which led to this guide.