In Next.js in _app do I need to use getInitialProps and why?

Question

React

I did not understand this moment how the application will behave if these entries are uncommented, and how if these entries are not uncommented.
Explain, please!

Answer 1

If you need to change props at this level, then, obviously, uncomment, and if not, then no.
Also at this level during the ssra there is a request and a response.