WordPress has a feature that splits up single post into multiple pages (WordPress Codex Reference).
It uses <!--nextpage--> inside the post content. Whenever a <!--nextpage--> is encountered in the post content, it is splitted to a separate page.
Example
Let the post content be
Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Aenean lobortis ultrices velit, at auctor dui tincidunt non.
<!--nextpage-->
Sed sit amet congue dui. Aliquam semper consectetur diam,
ac laoreet sapien venenatis ut.
<!--nextpage-->
Morbi vitae nunc ligula.
Vestibulum ultrices lacus non blandit varius.
and the post’s URL be /post/lorem-ipsum-post/.
Now, /post/lorem-ipsum-post/ will contain:
Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Aenean lobortis ultrices velit, at auctor dui tincidunt non.
<Link to /post/lorem-ipsum-post/2/>
/post/lorem-ipsum-post/2/ will contain:
Sed sit amet congue dui. Aliquam semper consectetur diam,
ac laoreet sapien venenatis ut.
<Link to /post/lorem-ipsum-post/3/>
and so on…
This feature is particularly useful when the post has huge amount of contents.
Maybe it achievable in current Hugo with a lots of manual work. But it would be great if Hugo has built-in support for this scenario.