It is recommended that you fill up site SEO meta options because they will serve as a backup for your pages.
Every page has its own set of SEO options
Zero One has integrated Sitemapper plugin, and you can see the sitemap at localhost/zero-one/sitemap.xml. Every page has its own option under the SEO tab for including in or dropping out that page from sitemap.
Also, Kirby 3 Robots.txt plugin is integrated, as you can see at localhost/zero-one/robots.txt.
Farther behavior of both of these plugins you control in Kirby config.php file.