As others have said, it depends on the situation.
Lets say you are taking a picture of a steam train with 5 carriages and you want them all in the shot and filling the frame. You are on the platform and the steam train is moving slowly so you don't have to move.
The first picture you take is with your lens zoomed in, the train and carriages fill the frame.
The second shot you take is with mid zoom, the third is at the wide angle setting, each picture is with the train filling the frame.
The first shot will have the train and carriages tapering away gently to the distance
The second shot will have the train bigger in proportion to the last carriage and the third shot will have a huge train with a tiny last carriage.
Then there's depth of field, the best way to see this difference is to take pictures of a wall or fence sideways on and filling the frame, at wide and zoomed settings. Try different apertures to see how the depth of field changes.
Try taking a picture of someone in a landscape at wide and zoom with the person covering the same amount of the image, notice how much more background is in the shot at wide angle.
It's said that a 50mm lens (35mm in a DX) photo looks much the same as a human eyes view.
Get out there and take lots of test shots, learning by shooting is the best way and costs nothing in digital. Have fun.