Here are several general features available in themes produced by Genbu Media. Each feature is modular. So, theme may or may not have this feature.
Social Icons
Theme with social icons feature can display your social account link with icons using WordPress Custom Menu features. This feature is very easy to use, because the theme will auto-detect your your link and display the right icons.
Custom Fonts
You can change your theme fonts from Appearance > Customize > Fonts (Section). Each theme can have different options for each element, but usually the options are "Site Title Fonts", "Post Title Fonts" and "Base Fonts".