So i recent got the K-wing and the twin laser turret, and now if got a question I probably should have asked earlier.

If I use the twin laser turret to attack and I roll two hits. The card says the defender takes one damage and cancels the rest....so is that one shield or a face down damage card?

It removes a shield if the ship you're attacking doesn't evade all damage and has shields remaining.

You would then perform the attack a second time, again removing one shield if your attack hits and they have shields remaining.

If they don't have shields, or none remaining, the attack will deal a facedown damage card for each attack that hits.

Shield if they have shields.

Cards are only dealt under shields if the thing causing the effect specifically says to deal a (faceup or facedown) damage card.

But, note, the defender still gets to roll green dice; only if their evades are less than your hits and crits, do you hit and then cancell all dice and do a damage.