haskell how to put the first element of a list at the end of a list code example

Example 1: first element in list haskell

list = [1, 2, 3]

head :: [a] -> a
head (x:_) = x

head list -- 1

Example 2: haskell append to list

1 : [2, 3]
--return [1, 2, 3]