How do you learn hosting new tools or technology?

Lately, I wanted to host nextcloud as a container with nginx, and expose it using Cloudflare Tunnel. Although I did it before with Vaultwarden, but this time I just get overwhelmed and reach nothing. I'm trying now since 2 weeks to do it with no success. I tried to read the documentation but it's like reading things I cannot relate to. Tutorials are just to do something specific and not what I want. The setting files of nginx and nextcloud, are very confusing. And sometimes there's some overlap with the environment variables in the docker compose file.
I'm really lost.

Do you have any suggestion? Like what do you do when there's a new tool or technology and you want to host it? How do you learn it?

P.S. I'm still a student and I have a good system administration background. But I want to understand how to approach learning how to host new techs and tools.