This article about Google Quality Score is, perhaps, a bit advanced for me, and a bit too in-depth to be skimmed. Worth a read if you have time to dive deep; seems to have been written from a real place of knowledge. Not sure if this is a Google employee writing or just someone who has done their own thesis on Google Quality Scores... either way, super useful.
Here's a snippet:
Every page indexed by Google has a content quality score assigned to it. This score directly influences how well a page ranks in Google. This however is not promoted by Google and few webmasters or SEOs are even aware of it.
This post will discuss how we know the content quality score exists, the signals that determine the quality score of a webpage and what can be done to ensure a high quality score for every page of your website.