Back to basics: Before the Big question – What’s worth knowing?

I always jump the gun on these big things. I can only be enawed at the deliberacy and applied hesitation of Santeewelding in this…
Asking the big question doesn’t really make sense without the underlying Need-to-know… it reads in the Manual, this whole thing is on a need-to-know basis.
So, what’s worth knowing in the first place?