For an example here, is the beginning of the HTML from dukelearnprogram.com.
The HTML tag, the head tags between which
other Metadata goes such as the title tags.
Next, we see examples of Sectioning Elements.
The <body> tag is a Sectioning Element.
The start and ending body tags define the body of the whole webpage.
All the text and other items seen on the page will be inside the body tags.
Other sectioning elements define sectioning within the body of
the web page.
For example, the <h1> tag defines a region with a more important and
usually larger header.
The h in <h1> means section head, the <h2> tag is also a section header,
but typically a little smaller than an <h1> tag.
The smallest header tag is h6.
The <div> tag is also a sectioning tag.
This tag defines a section or division of a web page.
It is useful for grouping elements together to use CSS styling.