The theme can be used with two different page builder plugins, SiteOrigin Page Builder and Elementor Page Builder. Both page builders allows you to build complex layouts without the need of using code.
The difference in builders is that SiteOrigin is more lightweight and Elementor is better for heavy customizations, there is not one better than the other as it fully depend on your own needs.
Some customers only want to change the text, images and global colors without making big changes to the default layout, in that case SiteOrigin will be more useful. Other customers looking forward to go beyond that and make changes till the smallest detail, then Elementor will be a better choice.