How do you add Headings to HTML?
For headers, you want the font size to be bigger to make it easier for users to scan the title/headlines.
Here is the tag to use for your headers.
<h1>This is headline</h1>
<h3>This is a sub-headline</h3>
Using the header tags, you can create headers and subheaders to signify to users which part of the text they should focus on.