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1)  Understanding the system

Unlike other Operating Systems, Linux can work with no GUI at all. The whole concept of it was to allow remote access, simple and "understandable configuration interface", and to stick up to POSIX.

This has lead to some basic directory structure, which should allow us to navigate easily in an unknown text based Unix OS, just like Linux, Sun Solaris, SGI Irix, IBM AIX, etc.

The way Linux is build allows us to customize it to fit to our needs. We can peel all kind of undesirable programs and "libraries" off the system, and have a skeleton "embedded" system.

Like other Operating Systems, there are problems here and there with Linux too, however, using this "understandable configuration interface", we can solve it without relying on GUI, which might fail sometimes, and without always being *near* the machine(!!!) (We can use telnet or other text based remote control methods, fast and simple, even while using 14,400 bps modem!)

The "understandable configuration interface" is also known as "English".