While talking to some of new Linux users, I noticed that it takes time for the new user to get used to Linux, particularly the directory structure. Since most are Windows users, they know how the directory structure of Windows looks like, and expects that it will be the same with Linux. To properly illustrate the Linux directory structure, linuxconfig.org has an illustration of the Linux File Hierarchy for easy explanation:

Understanding the directory hierarchy of Linux will result in ease of navigation while running the OS, regardless of the Distro (Ubuntu, Red Hat, Fedora, etc.)
Ubuntu is my current favorite so more details regarding its Filesystem can be found here
The April Online Work Index reveals that IT and marketing skills continue to dominate the online work landscape as the Top 10 graphic clearly demonstrates.