A few well known WordPress links: WordPress.org, the Codex and the download page.
Category Hierarchy
This post has 4 categories, part of a hierarchy that is 3 deep. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Fusce euismod commodo ante. Suspendisse potenti. Nunc pellentesque quam vel pede. Ut a lorem non urna molestie euismod. Fusce consequat tortor eu urna. Pellentesque aliquam, pede eget tincidunt feugiat, nunc massa hendrerit magna, non […]