ground
The word 'terreno' is used in Italian to refer to ground or land. It can be used to describe the surface of the earth, or the area on which a building or other structure is built. It can also be used metaphorically to refer to a subject or topic of discussion, similar to the English phrase 'common ground'.
I just bought a new land.
This sentence is talking about a recent purchase of land, perhaps for construction or farming.
The land in this area is very fertile.
This sentence is describing the quality of the land in a specific area, noting it as being fertile and thus good for things like farming.
The ground is slippery because of the rain.
This sentence describes the condition of the physical ground (like a road, path etc.) being slippery due to a recent rainfall.