What are the most important places to indicate relevance (use the phrase) for a target keyphrase?

The most important places to indicate relevance for a target keyphrase are the Title, Header, and Body text. The page title is critical for search engines to understand the page's primary topic. Headers (like H1, H2, etc.) break up content and signal important subtopics, reinforcing the keyphrase's relevance. The body text provides the detailed content where the keyphrase should be naturally integrated, demonstrating comprehensive coverage of the topic. Meta keywords are largely ignored by modern search engines due to past abuse, and meta descriptions, while important for click-through rates, don't directly influence ranking as much as on-page content. Subheads are a type of header, making "Header, subheads and body text" less comprehensive than including the main Title. While the URL is important for relevance, it's not as impactful as the content elements themselves.