IWTL how to pick up small details/mannerism in people social behavior

So I know kind of a weird title but I'll explain.

As a man I've observed that women (not to stereotype or generalize) are a lot better at picking up and noticing small things about a person that can say A LOT about their traits and who they are.

You ever hang out with a friend and you just sorta know based off intuition something is off about them? Or detecting ones body language that can signal someone is anxious or nervous even if its just seen as normal to most people?

How can I pick up on this?