Package

This manifest section is all about metadata for the package, such as name, version, and authors, but also a link to the documentation that defaults to the corresponding page (https://docs.rs/). While many of these fields are there to support crates.io and display various indicators (categories, badges, repository, homepage, and so on), some fields should be filled regardless of whether they are published there, such as license (especially with open source projects).

Another interesting section is the metadata table in package.metadata, because it's ignored by cargo. This means that projects can store their own data in the manifest for project- or publishing-related properties—for example, for publishing on Android's Google Play Store, or information to generate Linux packages.