To add to Michael's answer, specifically about having to win the poker hand in order to claim a benefit... it's really easy to tell when winning the poker hand is necessary:
You will see an icon that looks like a stack of poker chips.
So if you see an icon that looks like a stack of poker chips next to a spot, then you know that you must win the poker hand in order to claim that benefit or ability!
This depends on the type of space. You must be standing to win a resolution reward, you can be wounded to win winner’s pot.