Because that's how people count! fruits[1] is the first fruit, fruits[2] the second.
In View Code you'll see the real languages count from 0 instead, so B4Coder takes one away for you there.
Open it in the editor and run it, then change it and see what happens.
fruits = ["apple", "banana", "mango"]fruits[1]fruits[length(fruits)]applemangofruits = ["apple", "banana", "mango"]print(fruits[0])print(fruits[len(fruits) - 1])