There are a lot of running jokes that might be confusing at first, because this is a long-standing community with members that have been around for years (up to almost seven years now, in some cases). But none of it is intended to shut people out, so if you suspect something is a joke that you don't get, please feel free to ask. There is also a pretty good Search tool, as Bauke says, and there is also the Temple for technical questions about how the board works.