'Nesting' is a way of inserting content on your page which appears elsewhere in a definitive source
If you add content to a page by copying it or duplicating it by hand, and that information is available in a central source at UWA, the version of the content on your web page will become outdated and need to be maintained manually.Whereas if you nest the content from the central source, the version of the content on your page will be updated automatically when the centrally-maintained version is updated. This is always the most consistent and reliable way to add such content to a web page.