The head HTML element is used to contain metadata and links to scripts and stylesheets, providing essential information about a document.

The header HTML element represents introductory content or navigational links for a section or page, typically including headings, logos, or menus.

The h1 HTML element is used to define the most important heading on a page, typically representing the main topic or title of the content.

The h2 HTML element is used to define a secondary heading in a document, structuring content by indicating subsections under the main heading.

The h3 HTML element is used to define a tertiary heading, helping to further organize content into subsections under secondary headings.

The h4 HTML element is used to define a quaternary heading, organizing content into finer subsections under tertiary headings.

The h5 HTML element is used to define a quinary heading, further organizing content into detailed subsections under quaternary headings.

The h6 HTML element is used to define a senary heading, organizing content into the most detailed subsections under quinary headings.

The hr HTML element is used to represent a thematic break between paragraph-level elements, often rendered as a horizontal line to visually separate content sections.

The html HTML element represents the root of an HTML document, encompassing all other elements and defining the document type and language.