Fill in the blanks: The text within the ______ tag usually populates the text of your blue link on a Google SERP, and the text within the ______ tag populates the grey text underneath.

The correct answer is Title, meta description. The text within the <title tag is what Google typically uses for the clickable blue link (the title) on a search engine results page (SERP). This tag is crucial for both user experience and SEO, as it provides a concise summary of the page's content. The text within the <meta description tag populates the grey descriptive text that appears underneath the blue link on a SERP. While not a direct ranking factor, a compelling meta description can significantly influence click-through rates. "Meta description, H1" is incorrect because the H1 tag is a heading within the page content, not directly used for the blue link on a SERP. "Title, alt" is incorrect because the alt tag provides alternative text for images, not for the grey descriptive text on a SERP. "Alt, meta description" is incorrect for the same reason regarding the alt tag.