index

Question

Why does index of lists start with 0?

Answer 1

Because it was decided to be like this (it's easier this way).

Answer 2

because number system start with 0

Answer 3

I think It depends on how the list is stored in the Memory of your computer. A binary Number is used to address the list in Memory. To scan trough the list elements a binary Number is used too.
by convention a binary Number of all zeroes is refered to the Number 0

I know that some programming languages adopt a different convention and start counting the lists or arrays at 1

there is and interesting article on why we should start counting at 0 written by prof.dr. Edsger W. Dijkstra

https://www.cs.utexas.edu/users/EWD/transcriptions/EWD08xx/EWD831.html

maybe this helps!