Take it to where it belongs. Most do not, most are lazy, fat or both.
i leave it in the outside parking lot near the sidewalk then i hoist my heavy bags and lug them across the avenue where i catch the bus
Cart drop off. (And here they call them "buggies" which just irritates me!)
I put it in one of the cart things in the parking lot. Or walk it back up to the store.
all of the above.
I push it back.
Cart drop off
I always put my shopping carts back with the rest of them
I always take the cart back inside or at the cart drop area