A Military Insider (and presumably Trump's inner circle) has been dropping hints, questions, pointers etc on anonymous chatboards since 2017. People have been compiling these posts and doing their own research building a body of evidence to backup the idea of deep state and how it operates. The poster signs themselves as "Q". This is one of the places where people research and discuss about these posts.

Main stream calls is Qanon conspiracy theory and try to stop people from engaging, so there must be truth in all this.