Main Content (MC)

Main Content (MC) is the part of a page that directly helps the page achieve its purpose, as defined by Google's Quality Rater Guidelines.

Main Content constitutes 70-80% of the page and should consist of passage ready sections — every H2 is a standalone informational unit that's citable in AI Overview without context from the rest of the article.

MC consists of facts, complete and extensive sections with high information density.

Unlike Supplementary Content (bridges, links), MC directly fulfills CSI. Modern Main Content requires Information Gain — unique data, first-hand experience, and specifics that add value beyond what already exists in the index.

In practice, every H2 section in MC must pass the 'extract and quote' test — can AI quote this section as a complete answer?

If a section requires context from previous paragraphs or uses pronouns instead of entity names, rewrite it to be passage ready.