Hi,
Please have a look this: http://tldp.org/LDP/Linux-Filesystem-Hierarchy/Linux-Filesystem-Hierarchy.pdf
I think this can be very useful for a beginner/intermediate level user to understand the filesystem hierarchy and as well as it can be used as a reference to various linux commands and configuration files.
Filesystem Hierarchy Standard can also be very usefule posted by Zazzybob in this thread.
Regards,
Tayyab