it means you probably should not be betting soccer ... just kidding,
italy -1, -1.5 means if italy wins by 2 or more goals you win your full amount
if italy wins by one - 1/2 your wager would be a loser and the 1/2 push and returned
if italy draws or losses you would lose all your money.
basically you need italy to win by 2+ to win but you can get 1/2 your money back if italy wins by 1