Define number of footer widgets: Add hook for footer widgets:
Reference
How to create a custom WordPress loop with variable columns, and pagination.
How to remove and add new custom genesis footer
How to add a genesis footer with 4 widget areas
How to verticle align middle in Bootstrap 4
How to customize Genesis site title
How to hook into archive and single posts with WordPress Genesis
Genesis before entry content, top of the page, genesis after entry content, bottom of the page.