Linux.
Tasks (in order of logical progression): 1. Install the OpenSUSE distribution (a very similar distribution to Fedora) and configure it as a secure FTP server and ensure that other access methods (other than remote administration) are prevented. 2. Install CentOS, configure it as a Apache Web server running a WordPress site (this is easier than it sounds if you research it). Next, configure it as a Samba and NFS file server, and test your results. 3. Install the LinuxMint distribution (focused on desktop application) and explore the customization available in the Cinnamon and Xfce desktop environments. Configure it to connect to your CentOS server for persistent file storage. 4. Install Solaris UNIX and configure it to host files on ZFS volumes using Samba. 5. (Advanced) Install Gentoo Linux using the detailed installation guide available here (for this you will need to download a minimal install image from the Internet): http://www.gentoo.org/doc/en/handbook/handbook-amd64.xml Configure Gentoo as an NTP and DNS server (domain of your choice). 6. (Advanced) Install FreeBSD and configure it as a virtualized Apached web server using BSD jails (OS-level virtualization).