Why do you "need" to learn about servers?
For general information, I would recommend learning how to set-up a server using an old pc. Linux servers are easier, primarily because of cost (open-source), but windows servers are considered enterprise level servers.
If you have a windows pc, you can turn it into a Web Server using IIS relatively easy: .
There are different types of servers, knowing what type of server you're trying to set-up or learn helps determine the best path. (There are also WebDAV, FTP, and File Servers just to name a few).
Hope this helps.
I just wanna learn the basic about servers, I think might be a file server