In general, the /etc/fstab entries are for static (fixed) mount points, such as you might use if you created your own entries, in /mnt or /media or actaually anywhere you wanted to..
The other mounts are created on the fly by the OS when it reads the partitions or devices, as you will notice for usb flash drives
--most other mounts are created under /media/.. (the mount point used by the device)
--in the file manager you use, you should see the mounted device or partition being listed
Linux uses file locations for everything, that is unlike windows which uses drive letters then a location, Linux uses /, and puts everything else under that mount point (/, being the root of the file system)
--so you have /home/username (your logged in user)
and so on..https://en.wikipedia.org/wiki/Filesyste ... y_Standardhttps://en.wikipedia.org/wiki/Fstabhttp://www.tuxfiles.org/linuxhelp/fstab.html
--howto on fstab..