New card order gather

I have two questions about this section
There are two options named as “Ascending position” and “Descending position”, in both of them the description indicates they are based on “due #”.
But for “Deck” option it only indicates it’s based on “Ascending position”.
“Ascending position” of what?
Is it “Due #”?
The second question: What is “Card Type Number”?
I don’t understand the “Number” part!

Yes, deck sorts by deck then ascending due #. Card type is the order of card templates in the notetype, eg Card 1 then Card 2.