How do i get sharepoint data into node js using microsoft graph api

Hi,

I have followed following link to use microsoft graph API

https://docs.microsoft.com/en-us/graph/tutorials/node

I am  new to graphAPI,I want to add sharepoint data to that , in link there is calendor data is added but i want to add sharepoint data into that app

How can  i do that?

Please provide me information in  details.

Guide me how to do that 

Thanks