Section: File Management Programs - for Exploring the Disk
...Subsection: Things you can find in any file manager program
... ...Subsubsection: A list of subdirectories on the current directory

You should be able to find a list of the subdirectories that your current directory has access to. Sometimes you will see this as part of the picture of the tree structure. Sometimes subdirectories will look like little folders. Sometimes subdirectories will be listed in the same place as files! You can usually tell the difference, because the subdirectories will often have an icon like a folder to indicate they are not simply files but directories. Note that there might not be any sudirectories in a specific directory.