JavaScript React Basics (retired) Thinking in Components Decomposing our Application

need advice on reference

Hello Everyone.

I have made the application but i have some questions.

1 First when we use {} // This is not an object we are declaring them inline like calling a function
example <Player name="" score={}/ as you can see we are passing the information it's not being returned from anywhere can someone clarify?

2 What is the scope of an component do they all have access to each others values if accessed via .notation? If i make more functions that access {} will it reference the same as above components.