Thank you all, I only need AH -0.5 as will only play it.
Just giving my example here to make sure if I got it or not.
Example:
Team A plays vs Team B
I pick team A AH-0.5 so for me to win the bet, team A needs just only to win the game.
Is this right or not ?
Yes, that would be correct. I don't know why any site would offer +0.5 or -0.5 as it is pointless since it would make no difference to the actual score.
Maybe the odds would be the same as normal moneyline for those bets?