Video:
Hide a resource from search engines and sitemaps https://shopify.dev/tutorials/manage-seo-data-with-admin-api
By defaults it seems Shopify creates robots.txt with default rules https://STORE-URL/robots.txt
Update in Bulk: https://STORE-NAME.myshopify.com/admin/bulk?resource_name=Page&edit=metafields.global.seo
Page: https://STORE-NAME.myshopify.com/admin/pages/PAGE-ID
Page view source: view-source:https://SOTE-URL/pages/PAGE-NAME
REST endpoint: https://STORE-NAME.myshopify.com/admin/pages/11056808051/metafields.json
Blogs (Articles)
https://STORE-NAME.myshopify.com/admin/bulk?resource_name=Article&edit=metafields.global.seo
Test:
Collection https://STORE-NAME.myshopify.com/admin/bulk?resource_name=Collection&edit=metafields.global.seo
Test: https://STORE-NAME.myshopify.com/admin/collections/158869684324/metafields.json
Product https://STORE-NAME.myshopify.com/admin/bulk?resource_name=Product&edit=metafields.global.seo
Test https://STORE-NAME.myshopify.com/admin/products/4449125466212/metafields.json