Apple’s default approach for window management in the Finder is to provide you with one window in which you can access most of the locations you need on your Mac’s file system. In this manner, you should not need to have too many windows open at once; however, there may be times when you will have a number of windows to manage.
This may be especially true if you find it more intuitive to move or copy items by dragging and dropping them from one location to the next, and thereby have a number of windows open for your source and destination locations.
While you can view and switch between windows relatively easily use Apple’s Expose window-management feature, it may be a touch frustrating to constantly having your windows splay around on screen to grab them, and instead you might wish to have them in a more consolidated location on screen.
To do this, Apple has several services in OS X that can be used to manage your Finder windows:
Cycle through windows
A quick way to manage a few open windows on screen is to simply cycle through them by holding the Command key and then tapping the grave accent character (the tilde key), which is above the tab and next to the 1 on the standard US keyboard layout. Similar to how Command-Tab will switch between programs, this will switch between the current open windows.
Another easy option you can use is in the Window menu in the Finder, where you should see an option to merge all of the current windows into tabs in one window. This can be a convenient way to essentially move all windows into one stack and clear the clutter, without closing them. You can then select a tab and drag it out of the collection to make a new window out of it.
Collect windows on the main display
If you use multiple monitors with your Mac, then you may run into the frustration of having Finder windows scattered among them. An easy solution to this is to go to the Displays system preferences, where you should see a button at the bottom for gathering all windows. Clicking this will move and arrange all windows to the current display, allowing you to more easily pick from among them.