HTML provides six levels of headings — from <h1> (most important) to <h6> (least important).
When to Use
<h1>— Main heading of the page (use only once)<h2>— Section headings<h3>— Sub-section headings<h4>to<h6>— Smaller headings
Tip: Don't skip heading levels. Always go from h1 → h2 → h3, not h1 → h3.