Passing data to child components in ASP.NET Core + React

[cryy]

I don't know if I'm supposed to ask this somewhere else;

I have an ASP.NET Core application with React. I want to fetch data, let's say from the boot.tsx file or the Layout.tsx file (referring to files that come by default when you create an ASP.NET Core + React app in VS 2017) and then pass that data to other child components. How would I do that?