In Plain English
Headings are the labels in a page’s map. The page-level heading states the main topic, while section and subsection headings introduce the ideas nested beneath it.
Why it matters
Descriptive headings help people scan, navigate with assistive technology and understand how ideas relate. Choose the heading level for its place in the outline, not simply for its visual size.
Example
An H2 called “Watering a snake plant” is clearer than “More information”.
Common misunderstanding
Making text large or bold does not give it the structural meaning of a heading.