To set up basic settings for your site go to Customizer-> Basic Site Settings

Typography Settings
Font-family : Changes font family of the all text
Line-height : Changes line height of the all text
Font-size: Changes font size of the all text ( Note: This setting will not work for html sections having higher specificity of font size options)

SVG Background
SVG-Background : Choose your preferred SVG background from the dropdown options
SVG-Foreground Color: Changes SVG image foreground color
Opacity : Changes SVG image design opacity

Background Image
Background Image: Adds background image for the site.