While Subversion's flexibility allows you to layout 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, Branching and Merging. For details and how to set up multiple projects, see the section called “Repository Layout” and the section called “Planning Your Repository Organization” to read more about “project roots”.