Because of the transactional nature of websites, where users want to ‘grab and go’, it is best to use headings often online.
Readers tend to scan headings to find the information they need and will become impatient if there are not enough headings to help them navigate.
The other reason to use more headings on screen has to do with passive space on a page. In a print document, the margins around the text add white space. A computer screen formats text right to the edges of a window, making it more visually dense. Adding more headings helps to balance the amount of white space.
It is also best to avoid too many subheadings online. Most web pages should be fairly short and 1 heading level will suffice. But even on longer web pages, avoid more than 2 heading levels.
