In order to be successful in betting with a -0.75 handicap, your team should win by two or more goals. If your chosen team wins by one goal then half of your stake is returned and the remaining half will be settled as a win at the odds taken. However, if the match ends in a draw then you lose your stake.
A handicap of +0.5 means that the bookmaker has given a +0.5 advantage to one team or player over the other. A bet on the disadvantaged team will win only if such a team wins by more than 0.5 points or goals.