If you start creating documents without thinking about where in your folder hierarchy they should go, you may end up with a huge, unwieldy folder full of files, or with related files scattered through a half-dozen similarly named folders. Break down your site into categories. Use subfolders where necessary. Decide where to put items such as images and sound files. It's convenient to place all your images, for example, in one location, so that when you want to insert an image into a page you know where to find it.
Designers sometimes place all of the non-HTML items to be used on a site in a folder called Assets.
Or you might have a separate Assets folder for each group of related pages on your site, if there aren't many assets shared among such groups. Use the same structure for local and remote sites. Your local site and your remote Web site should have exactly the same structure. If you create a local site using Dreamweaver and then upload everything to the remote site, Dreamweaver ensures that the local structure is precisely duplicated in the remote site. Another area where planning pays off is navigation.