"Over" implies movement above the surface of something without implying enclosure. We use "through" for movement inside or among something.
Use "through" to describe movement from one end to another within an enclosed or defined space. It implies direct passage or movement inside or among something:
The train went through the tunnel, emerging on the other side of the mountain.
James is driving through the city.
Use "over" to describe movement above the surface of something without implying enclosure.
The plane flew over the city, giving passengers a spectacular view of the skyline.
The bridge spans over the river, connecting the two banks.
We also use "over" to imply control or supervision.
Alice watched over the children as they played in the park.
Olivia presided over the meeting, ensuring that the agenda was followed.
For time expressions, we use "through" to show that an event or action continues from one point in time to another.
Our team worked through the night to finish the project before the deadline.
When "over" is used in the context of time, it typically refers to a duration or a period during which something happens or is spread out.
My wife and I plan to take a vacation over the summer.
