This will help give a larger picture of where things are. This is a little like viewing the tip of an iceberg. The directories you see are the parent directories of other directories, in which there may be other directories, and so on. Here, among other things, you'll find configuration files, which are files that help make programs work for your system, store program and system settings, and more. Well, when you were logged in as root, one of the first things you did was create a user account.
Libraries contain commonly used code that can be shared by many programs.
Red Hat Linux uses the RPM technology of software installation and upgrades. Using RPM , either from the shell prompt or through Gnome-RPM , is a safe and convenient way to upgrade or install software. For more information about using Gnome-RPM , see the Official Red Hat Linux Customization Guide. Once you become more comfortable with your system, you may want to install software not available in RPM format.