What's the difference between "sidewalk" and "curbside"?
From an American standpoint, sidewalk is the path you walk on beside the road, but curbside would be right on the edge of the sidewalk, where the curb is.
Curbside is usually used in phrases like: "Curbside pickup" and "Curbside delivery."
Since vehicles normally can't drive on the sidewalk, taxis, buses, or delivery vans stop at the curb. This is why those phrases are used. Does that help answer your question?
The sidewalk is a paved area for pedestrian traffic next to a road. "Curbside" is the area immediately next to the road. "Sidewalk" is a noun, "Curbside" is an adjective.
In this picture, the sidewalk is the paved area, and one might say that the parking meters are "curbside". I hope that helps.