I feel dumb asking but I just want to make sure - why is the answer 2 storage spaces instead of 1? (for the first two examples) Is it because you can't have two cards in your hand at once so you can't place and remove one at the same time?
Yes, that's exactly why. Your hand isn't considered a storage space where you can keep something. It's just something that moves the cards around.
Thank you that's a clear way to explain it!