All of those nonmilitary people suffered terribly. So it's important to read about all sides of a war to really understand it.
Here are some of the titles I would strongly recommend for a rounded understanding. They are listed in the order I read them-NOT best to worst:
All the Light We Cannot See-Doerr
The Nightingale by Kristin Hannah
The Summer Before the War-Helen Simonson
In Farleigh Field: A novel of WWII
Lilac Girls: A Novel (about WWII)
Beneath A Scarlet Sky-Mark Sullivan
Winter Garden-Kristen Hannah (WWII)
The Ragged Edge of Night-Olivia Hawker
The Zookeeper’s Wife-Diane Ackerman
The Tuscan Child-Rhys Bowen
We Were the Lucky Ones-WW II-Georgia Hunter
Even if you're not interest in history, these books are great reads. Worst case scenario, at least you'll be entertained. Best case scenario, you'll come away with a deep understanding of the suffering and courage of so many people-certainly not just soldiers.