I have trouble believing anyone with the remotest knowledge of US politics is unaware of the scandal, but https://www.britannica.com/event/2012-Benghazi-attacks . 'Reactions and investigation' has the information you apparently missed all these years.

https://www.wsj.com/articles/SB10001424052970204712904578090... - "What we now know—and still don't—about President Obama's 9/11." is pretty good too.