If you're new to Linux, knowing how the file system is laid out will alleviate some confusion.

Take a look at the The Linux System Administrators' Guide. Chapter 3 is all about the linux FS orginazation, tho it admits to not being as detailed as the FSSTND.

If you're coming from Windows, the Linux file system structure can seem particularly alien.

Navigating the Linux filesystem hierarchy can be a daunting task for newcomers and even seasoned administrators. Unlike some other operating systems, Linux follows a unique directory structure that is ...