While Subversion’s flexibility allows you to lay out your repository in any way that you choose, we recommend that you create a trunk directory to hold the “main line” of development, a branches directory to contain branch copies, and a tags directory to contain tag copies. For example:
$ svn list file:///var/svn/repos /trunk /branches /tags
You’ll learn more about tags and branches in Chapter 4. For details and how to set up multiple projects, see Repository Layout and Planning Your Repository Organization to read more about project roots.