Understanding the importance of header fonts and body fonts on a website is necessary in order to help move along visitors to the correct links and information they need, allowing them to make informed purchasing decisions and much more!
You want to use header fonts (larger, bolder fonts) when you want to attract attention to text quickly due to its importance.
The body text will then confirm the importance of its header counterpart, reinforcing the importance with further detail.
The button should then direct the visitor to where they need to go.