"Instead of nesting definitions" in docs

On this page: https://react.dev/learn/your-first-component

When a child component needs some data from a parent, pass it by props instead of nesting definitions.

all of a sudden, it says, "instead of nesting definitions". Can you explain in the docs more what is "nesting definitions" and how does it work to "attempt to pass some data and doesn't work or shouldn't be done"? I have never heard of "nesting definitions" after working with React for a few years.

Comece pela página “Your First Component” em https://react.dev/learn/your-first-component e localize a frase que contém “instead of nesting definitions.”. Revise a página vinculada “Passing Props to a Component” para obter contexto e, em seguida, esclareça o que significa aninhar definições e por que props são preferidas. O trabalho estará concluído quando um usuário de React puder entender a frase e a orientação pretendida para passar dados.