What element can be added to a blog post to determine content for the homepage?

Adding a "Read more separator" to a blog post is a method used to control how content is displayed on your homepage or blog listing page. This separator indicates where a summary of the post will end and where the rest of the content begins. When viewing a blog listing on the homepage, the content above the "Read more" separator becomes the teaser or excerpt that is displayed, enticing readers to click through to read the full post. This helps in organizing the content and enhancing user experience by providing a clear distinction between various blog entries.

Using other elements like featured images, meta descriptions, and tags and categories, while important for SEO and organization, do not specifically control how the blog content itself is presented on the homepage. Featured images serve to visually represent the post, meta descriptions are used for search engine snippets and do not affect homepage presentation, and tags and categories assist in sorting and filtering content but do not dictate the structure of how blog posts are displayed on the homepage. Therefore, the "Read more separator" is indeed the element that directly impacts the homepage content layout.