General font settings can be adjusted from this section. To adjust the font settings, head to Theme Options, Typography, General.

Content Fonts

The font in this section are used for body contents, mostly all post, page body contents are using these font settings. Adjust as per your needs and save settings.

Main Menu

The fonts are adjusted for main menu (Primary Menu Location). You can control the font face, font weight, font size etc.

Page Title

Page title fonts are applicable on all article types like post, page etc. The title fonts are adjusted in this section.
You can also adjust the post titles in archive listing page, ie; blog page that lists all the posts. The font property of those titles is adjusted here.