Bellissima is the code name for the rebuild of the frontend code of the backoffice of Umbraco. Bellissima replaces the old deprecated AngularJS code with Lit, TypeScript and Web Components as well as a flexible extensions API.
In this post, Yari Mariën outlines the process of enhancing a custom section in Umbraco 14 by adding routing, creating a root page, and displaying detailed views for tree items. Key components include defining routes for creating and editing forms, utilizing a shared component for both functionalities, and implementing navigation through tree items.