A collection of links that may help you better understand the leaked APIs, references attributes and how Google Search works in general.
Google : How Search Works
- https://www.google.com/intl/en_uk/search/howsearchworks/how-search-works/organizing-information
- https://www.google.com/intl/en_uk/search/howsearchworks/how-search-works/ranking-results
- https://www.google.com/intl/en_uk/search/howsearchworks/how-search-works/rigorous-testing
- https://www.google.com/intl/en_uk/search/howsearchworks/how-search-works/detecting-spam
Google : Search Essentials (Guidelines)
- https://developers.google.com/search/docs/essentials
- https://developers.google.com/search/docs/fundamentals/seo-starter-guide
- https://developers.google.com/search/docs/crawling-indexing
- https://developers.google.com/search/docs/appearance
- https://developers.google.com/search/docs/monitor-debug/debugging-search-traffic-drops
- Specific guidelines (Ecom / International)