How many terminals are there in Atlanta and How easy is to access the domestic flights ie from EWR to Grand rapids.This is gonna be my first flight in Atlanta.

Terminal North and terminal South

Its very easy actually. Hartfield Jackson has a train system or moving walkway that connects you to all concourses. There is T, A, B, C, D, E, AND F concourse.

2 terminals. Terminal North and Terminal South.

There is an underground train system that will take you to any terminal you desire plus the sings are very clear. You can always ask for assistance from any airport official.