During Rev. Tiffany's Eighth Principle sermon she referenced some resources to go deeper into this topic. Here are a few great places to start.
Eighth Principle Website, specifically the "background" page: https://www.8thprincipleuu.org/background
A few really key blog posts from Shannon Lang:
https://www.uua.org/braverwiser/putting-armor
https://www.uua.org/worship/words/reading/doing-work-needs-be-done
Sermon from Rev. Paula Cole Jones, one of the authors of the Eighth Principle, about the Eighth Principle: https://www.youtube.com/watch?v=bUvJ3c1xSu8
And Ibram X. Kendi's book "How to Be Antiracist": https://www.amazon.com/How-Be-Antiracist-Ibram-Kendi/dp/0525509283/