Hi, Callum! There is a 5000 word program FAQ (!!!) for nominators, and then I onboard new participants with an hour-long training session each month, and then offer ongoing 1:1 support.

In terms of publicly available documentation, all nominators use the Medium Quality Guidelines:

https://help.medium.com/hc/en-us/articles/360006362473-Medium-s-Quality-Guidelines-How-real-humans-review-stories-for-Boost

And I also share the Medium Curator Training Manual with them, which is available to the public:

https://medium-teamspace.notion.site/Medium-Curation-Manual-How-to-Assess-Story-Quality-01277bfcb0d94894b80f4aa1be76ade9