Definitely not only for server administration. As a beginner you'll find a lot of help online (tutorials, how-tos, etc) for probably any issues you could ever stumble on.
Discussion
Can u say something about this https://zorin.com/os/
no experience with it, but as long it's nothing very specific to zorin, all ubuntu and by that also debian documentation will help in case of problems. nevertheless, I personally would start with ubuntu just to avoid additional sources of problems.