Here are some things you may wish to think about and investigate in the stories in "Lives of the FWW". It is a free resource to investigate but you will need to register here : https://livesofthefirstworldwar.org/
When the war started and ended.
Which countries were involved.
Where the main battles were fought.
The ages of the soldiers.
The technology involved.
The conditions in which soldiers lived and died.
What did you find out? Talk to your friends and family about the development of your knowledge and understanding of the FWW.