Here's the list:

1. Listen more to more Black people – and amplify their voices
2. Think before you post
3. Call in, call out, and/or report anti-Blackness when you see it
4. Support Black people and Black-led instances and projects
5. Approach it intersectionally

The full article goes into detail, and also has links to anti-racism resources and appendices with a list of common mistakes to avoid and blocklist resources for moderators.

Thanks to everybody who gave feedback on earlier drafts!

(Update, 8/19: I changed the wording on #2 to match changes in the underlying article)