Themes and categories are also a handy way to find Learning Centers and Resources that relate to a topic you're interested in. In the "Search" box, type in the name of a theme or category to see all related items on the site.
In addition to those themes and a few that are built into the site (e.g., Alaska, Leadership, Food), users can create their own tags, which become categories. Whenever you upload a Resource or create a Learning Center, you will be asked to supply categories. Some will have been identified by previous users, and some will be new to the site.