Preparing to Build Your Web Site
Now you can start building your web site using a web authoring tool. We will be using Kompozer or Seamonkey Composer in this example (because it is free) but you could use any web authoring application. First of all, make a folder to store all of your web pages, images, and other files for your web site. You can call your folder public_html. You should always make a backup copy of your web site on a floppy disk, CD-ROM, or an external drive.
Previously you made one web page, hello.html. An actual web site is made up of many files. Some of these will be .html files, others will be image files, sound files, animations, and so on. Each different type of file has a different filename extension. Here are some common filename extensions"
There are actually many types of file formats and associated filename extensions. Here is a complete listing of filename extensions.