In football betting, a +1.5 handicap means that the team you are betting on is effectively starting the game with a 1.5 goal head start. If you bet on a team with a +1.5 handicap, your bet will win if the team either wins the game or if the game ends in a draw.
A 0.5 Asian Handicap is a popular betting market in sports betting. It is also known as a half-goal handicap. A 0.5 Asian Handicap means that one team starts the match with a half-goal advantage over the other team. In a 0.5 Asian Handicap, it depends if you placed a bet on the favourite (-0.5) or the underdog (+0.5).