What is the best way to read a json in flutter?

Question

I’m entering the world of development and learning Flutter to program for mobiles.

The basic operation of my app will be to read a JSON from my server and play on a list in the app.

Doubts:

1. What are the best practices for doing this?
2. I create a class and for each item of my json I prompt?
3. Or simply pick up the json response string and play in a Map(which is like a python Dictionary), or I do it some other way?