There were many differences in fighting in the first world war.
Firstly the locations of the two world wars were very different. The First World War was fought mainly in France with trenches dug for over 400 miles in length.
However the Second World War was fought worldwide in every continent excluding America in places such as the Pacific, North Africa, Europe, Norway/Finland, the Middle East, South East Asia, and China. It was fought on the ground, sea and in the sky. With World War 1 and trench warfare the strategy of both sides was more to defence than attack. They would guard themselves in the trenches and launch sudden attacks on the enemy. Chemical warfare was created in World War 1 for example the German’s used mustard gas to kill the enemy in the trenches.