I am new to DD and i find the auction house kind of confusing. What is the fastest way to sell cards on the market?
Sell now. Find the player click on it and sell it to the highest bidder.
What he just said ^... however in my opinion that is also the dumbest way to sell them as well.
Quickest way is "Sell Now". But you won't maximize your stubs that way. Best way is to look at the "Buy Now" price on the player, and put in a sell order for slightly less than that. You'll almost always get more stubs that way.