Get elements of a list

squares = Range[10] ^ 2

{1, 4, 9, 16, 25, 36, 49, 64, 81, 100}

Part[squares, 3]

9

squares[[1 ;; 5]]

{1, 4, 9, 16, 25}

Take[squares, {5, 8}]

{25, 36, 49, 64}

squares[[-7 ;; ]]

{16, 25, 36, 49, 64, 81, 100}