For questions about how authentication within the Stack Exchange network works. General questions about authentication are off-topic, but depending on the specific question may find a home at e.g. Stack Overflow or Security Stack Exchange.
For questions about how authentication within the Stack Exchange network works. General questions about authentication are off-topic, but depending on the specific question may find a home at e.g. Stack Overflow, when it's related to implementation, or Security Stack Exchange for more generic questions about authentication.