When Server Core originally shipped, a lot of Windows admins avoided it because you could only use the command line, but this changes with Windows Server 2012 which enabled the use of a hybrid mode.
Step 1: Open PowerShell and type in: Remove-WindowsFeature Server-Gui-Shell, Server-Gui-Mgmt-Infra
Step 2: Hit Enter. You must restart the server to finish the removal process.
Step 3: Enter the shutdown command: “shutdown -r -t 0”
Step 4: That’s it. Congrats you are done!