Best practices seem to be having a moment. In the ten years since the Books Advisory Group first created a best practice guide for books, the community beyond Crossref has developed or updated at least 17 best practice resources, as collected here by the Metadata 2020 initiative. (Full disclosure: I co-chair its Best Practices group.)
ROR announces the first Org ID prototype
2019 February 10
Request for feedback on grant identifier metadata
2019 February 07
Underreporting of matched references in Crossref metadata
2019 February 05