The term '411' is often used in American slang to refer to information or knowledge about something. It originates from the directory assistance number (4-1-1) that people would call to get phone numbers and address information. Thus, when someone says "Give me the 411," they are asking for the details or the scoop on a particular topic.
The term '411' comes from the telephone service in the United States that provides directory assistance. The number 411 was designated for this service, and over time, it became colloquial to use "the 411" when referring to information or news.