How to understand CrossAttention in an intuitive way?

Hi all,

I am learning cross attention recently and I know how it works, with query and key/values from different embeddings. But I want to know how to understand this intuitively and in a high-level context, because when I design a network architecture, it's difficult for me to know which one should be key and which one should be queries or values, who's attending to who and why. Some tips from this perspective would be very useful! Thanks in advance

architecture attention context deeplearning design embeddings key network network architecture query values