IMO there is no better information than the stuff freely available from the largest search provider. https://support.google.com/webmasters/answer/9128668?hl=en

IMO there is no better information than the stuff freely available from the largest search provider. https://support.google.com/webmasters/answer/9128668?hl=en&ref_topic=9128571 https://support.google.com/webmasters/answer/9128668?hl=en&r... Anything else is a loophole or bug yet to be patched.