Doubt regarding auto

#1

I though that we can use “auto” everywhere instead of typing datatype.
But it seems we can’t !

Could you please explain where we can ?

#2

you can use auto everywhere

this is a good article on this
about Auto

#3

@asaurabh_26
but why here it shows error

#4

auto will not work in this case
you can use vectors for that

auto v1= vector {1,2,3,4};

c++ is not loosely typed language like python or javascript
we have to give the type once to tell the compiler that this is a vector of int or array of int
after that we can use auto