The concepts that Google calls MC

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This guide, called QRC (Quality Rater's Guidelines) , contains over 160 pages of content on what Google considers good for a site's pages.

But the main thing we can take away from this guide is its basic principles. The EAT (Expertise, Authoritiveness, Trust) is a term that could be translated as PAC (Expertise, Authority, and Credibility).

Better understand the role of each of these elements in evaluating the quality of rich people data a site:

Expertise
Because they deal with important and sensitive issues, such as users' money or health, Google expects YMYL pages to be made only by those who have the knowledge and structure to do so.

(Main Content) and SC (Supplementary Content) help to indicate this level of expertise.

The main content must be broad, sufficient to address the topic you propose to discuss (larger articles for broader topics);

Additional content, on the other hand, should aid in the user experience by reinforcing the purpose of the page, not distracting from it.

Authority
It is not enough to offer information that users consider relevant. In the end, users are not always in a position to make that assessment with regard to issues that they understand little about.

Based on this principle, the quality evaluation of a page also depends on the authority of the company and who produced the content in question.

If it’s a product page, positive customer reviews can help. An “About Us” page that helps clearly identify who is responsible for the content is also of great value.