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It is recommended that you fill up site SEO meta options because they will serve as a backup for your pages.
First check out and setup Site SEO options.
Site SEO options
Every page has its own set of SEO options
Page 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.
Farther behaviour of both of these plugins you control in Kirby config.php file.
We made great care to include all possible meta information on every page, and most of them are automatically generated. You can check it out by looking at the source code of every page.