Why don't you just say, "I don't know"? An Itemized list of what someone should know is a great way to set goals. In general, I already know what is important. But BJJ has specifics that are different then other sub grappling arts. Just get out there and roll, is a waste of a response. I am looking for BJJ specific and best case. Part of it is to get a feel for what the belts mean in technical terms.
In Judo for example, a Brown belt will be expected to know a set syllabus of techniques. If I am going for my brown belt, rather than waiting until my instructor gets around to teaching me, I can actively research those techniques. In BJJ, there isn't that agreed upon syllabus. So I am asking for the collective knowledge of the board, to come up with a "things you should know as a blue belt" list. That way I can research techniques I don't know, because I like to do that. I like to learn actively rather than passively wait until an instructor gets around to it. Also, other members who may be at the Blue Belt level can look at it and say, "hey I should probably learn that techinque". Then they can learn actively too.