Exhausing a Card

In a fight I used the Hard Knocks card, paying 2 resources.

Do this exhaust the card, or can I use it in another attack in another action in the same round?

Hard Knocks do not have an action trigger but a free trigger.

It doesn't exhaust when you use it but take note that it is not an event so it has to be in play first before you can use it. So you need to pay 2 to play it then you can use its ability as long as it remains in play.

Thank you, it was in my play area, so I played this right.

The kind of trigger does not matter. Cards that exhaust say so specifically.

Just to add a little more to this: Exhausting a card is typically specified as a cost of using an ability printed on the card. If a card is exhausted then it cannot be exhausted again, so that ability cannot be used.

However, some other game effects can cause cards to exhaust, but exhausting a card doesn't necessarily prevent it from being used (i.e. exhausting a card doesn't "disable" its text). So even if Hard Knocks was exhausted it could still be used because its free triggered abilities do not require you to exhaust the card to use them.