Genesis blocks are a set of blocks designed to expand customization of your site. To find and use these blocks in your editor, simply search for them in the block add panel by typing Genesis or by typing the name of the block itself.
These blocks include Advanced Columns, Newsletter, Pricing Table, Post and Pages Grid, Container, Call-To-Action, Testimonial, Sharing Icons, Author Profile, Accordion, Button, Drop Cap, Spacer.
A description of these blocks can be found here.
Note: the Genesis Block plugin is included with your WordPress site by default. You can search for these blocks and begin using them without any additional configuration.