Usage patterns
〈場所〉の端っこに座るto sit at the edge of a place
I sat in a seat at the end of the train car.
パンの端っこthe end piece (crust) of a loaf of bread
I like the crusty end pieces of bread.
〈物〉の端っこを切るto cut off the end of something
I cut off the end of the fish and threw it away.