Yes I think so we built a deck out of it.
I think it means it is primed with a protective coating and ready to paint or no need to paint
Yes it will work for a raised bed, but will rot over time...
Yes, this wood can be used a raised garden box
Yes this is what we used it for.
I believe they do cut to your size the first three pieces
We added a water seal but haven't had any rain yet hopefully soon and it is really strong so we will see
Very Green to wet to use.
there is no difference between the two