Fight club

I see this at times when reviews are posted or some questions are asked. What does this mean?

Have you ever seen the movie Fight Club ?? Lol

First rule of fight club is you don't talk about fight club The first rule of Fight Club. The second rule of Fight Club is: you DO NOT talk about Fight Club!

So how does one learn about fight club in this instance

Become a trusted member via reviews and other contributions while not revealing information that LE might find useful.