How to Use H1, H2, and H3 Headings for Readers and SEO

A reader scanning a guide to replacing a filter should be able to jump straight to the tools, installation steps, or troubleshooting section. Write the outline as a set of useful signposts before choosing the font sizes.

Give the page a clear main heading

Use one descriptive H1 as an editorial convention. It can echo the SEO title without matching it word for word. Include the specific task or product when that helps the visitor confirm they landed in the right place. Don't turn a slogan into the main heading if it hides the subject.

Nest sections by meaning

Use H2 for the major sections and H3 for subsections within them. “Install the replacement” might contain “Remove the old cartridge” and “Check the seal.” Use CSS or the builder's style settings for visual size rather than choosing a heading level because it looks right. W3C’s heading tutorial.

Read the headings by themselves

Inspect the rendered outline, including headings inserted by the template or sidebar. Replace repeated labels such as “Learn more” with the actual question the section answers. If the page has a table of contents, follow each link on a phone and check that a fixed header does not cover the destination.

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