Chapter 1, Authoring Modules, will really get you on the right path to higher quality Puppet modules and manifests, introducing 12 best practices for module writing.
Chapter 2, Roles and Profiles, introduces two additional layers of abstraction and improved interfaces for making your hierarchical business data easier to integrate, making system configurations easier to read, and making refactoring easier.
Chapter 3, Extending Puppet, covers three parts of the ecosystem that can still be accessed at the Ruby level for the purposes of extending Puppet to suit more advanced use cases; namely, custom facts, custom functions, and types and providers.
Chapter 4, Hiera 5, covers the latest incarnation of Hiera, which allows ...
