Businesses, educational institutions, governmental agencies and other organizations around the world are converting their computer operating systems from Microsoft Windows to Linux at an increasing pace. They are likewise converting their application programs from commercial software to free software (also referred to as open source software). There are at least 25 reasons for this situation, including:
Click Here

Guide to Linux Filesystem Mastery
Although the kernel is the heart of Linux, files are the main vehicles through which users interact with the operating system. This is especially true of Linux, because in the UNIX tradition, it uses the file I/O mechanism to manage hardware devices as well as with data files.
Unfortunately, the terminology used to discuss Linux filesystem concepts is a bit confusing for newcomers. The terms filesystem and file system are used interchangeably in the Linux documentation to refer to several different but related concepts. They refer to the data structures as well as the methods that manage the files within the partitions, in addition to specific instances of a disk partition.
To further confuse the uninitiated, these terms are also used to refer to the overall organization of files in a system: the directory tree. Then again, they can refer to each of the subdirectories within the directory tree, as in the /home filesystem. Some hold that these directories and subdirectories cannot truly be called a filesystem unless they each reside on their own disk partition. Nevertheless, others do refer to them as filesystems, contributing to the confusion.
More…