I feel like the veterans combined have more or less gone over all the relevant game mechanics, often multiple times. Just need to collect the info together in one place. Should be done in a wiki so multiple people can contribute, and so it can be updated in the future. I'm willing to review matters of dispute or controversy, but actually writing in-depth and at length on basic mechanics is not terribly interesting work. I'd rather be contributing to new knowledge and insights.
I have written mini-guides on various subjects, but they quickly get lost in the daily churn of the forums, which doesn't exactly motivate me to write more.