LKBLKB,
Your "HOME" folder is the outer container for sub-folders, and it is these sub-folders into which all of your files should go. Everything within it is owned by
you, not by another user, and not by the "system."
Within your HOME folder, there are a few "default" folders that are created for your use. By default, they include: "Documents," "Desktop," "Downloads," "Library," "Movies," "Music," "Pictures," "Public," and "Sites."
These folder names are intended to be obvious, and most are. Each one is intended to be used for specific purposes:
Documents is where you should store.... documents. Any documents you like. Within this folder, you can create any sub-folders you desire, in order to organize your documents as you see fit. Regardless of how many people use your computer, how many accounts are in place, this folder is for "your eyes only," and others will be allowed to view the contents only if you allow it.
Desktop is where any items that may be left sitting on your Desktop actually live. Your Desktop (what you see on your display, when no application is running or visible) is not a "place" in the file system, it is merely a reflection of what is in that "Desktop" folder (which
is a location within the file system). This, too, is off limits to any other users.
Downloads is the default folder for... downloads. Safari will be set to save any downloaded documents, applications, etc., in this location by default. If you like, you can change this in Safari's preferences. Other browsers can also be set to use this folder for any downloads. Or not, as you choose.
Library is a rather special place. This is where all of your application settings ("preferences"), caches, cookies, temporary data, etc. etc. is stored. It is the "library" of settings and data that are unique to you. Some applications, like Address Book, Mail, iCal, etc., actually keep all of your related user data in this folder. For example, within this folder is your "Mail" folder. Nested within it will be every email you have kept in "Mail," the application, plus any associated attachments.
Movies is pretty self-explanatory, and it is the
default location in which iMovie projects will be created. This behavior can, of course, be changed at will. Your will.
Music, too, is self-explanatory. Obviously, this is where iTunes will store your music library (unless you change that).
Similarly,
Pictures is where iPhoto stores your images, when you import them from your digital camera, a CD/DVD, or anywhere else.
Public is another somewhat special place. This is one of only two folders you have into which other users can "see." It is "public." This is where you'll need to put any files that you want others to be able to access. It can be seen by other users on your computer, or by other computers across a network, provided you turn on "File Sharing." Now, if other users want to give a file to
you, they can place that file into your "Drop box," within this "Public" folder. Other users cannot see the contents of this folder, but they can drag items onto it, thereby placing that file in it.
Finally, there's the
Sites folder. If you build a website, either in iWeb or some other application, this is the default location for that site's storage. When you turn on "Web Sharing," whatever site is placed in this folder will be "served" across the internet, provided you have an internet connection. By doing this (building a website, placing it in this folder, then turning on "Web Sharing"), you effectively turn your computer into a web server, and anyone on the internet that knows your "IP Address" can view it!
Now, your Finder Sidebar (the left side of any Finder window) includes "shortcuts" to some of these folders by default. You can turn these shortcuts on and off in the "Sidebar" tab of your Finder's preferences (
Finder>Preferences...). Also, you can drag any items in or out, as you see fit. Items can be dragged into the Sidebar from the body of the window, in order to give yourself quick access to them, or they can be dragged out to eliminate clutter in your Sidebar. If you'd rather have some item with a "shortcut" at the top of the Finder window, in the "Toolbar," you can drag things there, too.
Regardless of what you have in the Sidebar or Toolbar, they are merely quick ways to point that Finder window to that location
within the file system. It is the file system that you see in the body of the window.
Hmmm. I may have given a diatribe on the structure of the file system, but I don't think I have actually answered your real question. So, here it is: You shouldn't keep
any files in your HOME folder, but rather you should place them into the appropriate sub-folders. If necessary, you can create that "appropriate" folder. You should be aware, however, that any folder created right there within your HOME folder will not automatically be protected from "prying eyes," should they exist. You can either create tat folder within one of the folders that
is protected, or you can create that protection yourself in the "Permissions" section of the folder's "Getinfo" window (select the folder, then press Command-I).
Concerning unknown items in your Documents folder: Some applications automatically use your Documents folder to store your data within that application. Word, for example, will automatically create a "Microsoft User Data" folder within the Documents folder, when it is first launched by you.
Scott