You add a value to a feature. It goes into the type union, into the metadata map the create form renders from, into the access table, into the shelf that decides what appears on the landing pages, into the sitemap. You write sample content for it.
Source: [Dev.to](https://dev.to/lumorakids/the-value-was-in-nine-places-and-one-enum-and-the-enum-was-the-only-one-that-ran-5ck9)