From my occasional browsing of GD it appears to be to troll your enemies, dox them before you, and to mock the obligatory pictures of their women. Apart from that it seemed to be a giant shit show that I’m too late to the party to really care to sort out.
Then I found the “high round count” threads posted by Ron at Henderson Defense. Lots of very interesting information and experiences about what guns hold up and what doesn’t at a high volume shooting range. You can pretty much skip all the posts that aren’t by Henderson Defense if you just want the good stuff. Here are the links for those I have right now, will continue to add them as I get around to it.