An Asian handicap +/-2.5 is a half line handicap that starts off the favourite team on a deficit of 2.5 goals and the underdog on a surplus of the same number of goals. This is a single Asian handicap bet, which is the most common kind of handicapping option at the sportsbook.
If we were to back them on a +3 handicap, as far as this bet were concerned, they would start the game three goals ahead. For that bet to win, they would have to not lose by more than two goals because a three-goal defeat would mean the match were level from the perspective of the handicap bet.
Most often, outcomes with handicap can be found in football, hockey and basketball matches. Handicap 1 means a bet on a first team (the host team). It can be either positive or negative. Bookmakers commonly abbreviate it as H1 (+1), H1 (-1), H1 (+2), H1 (-2), etc.
In this case, your golf handicap is described as a “plus.” If you were one better than scratch, you would have a “+1 golf handicap.” To give you some perspective, the top players on the PGA tour have golf handicaps in the +8 range. We can all agree that's a good golf handicap!
Technically, a player with a 3+ is considered professional and in the upper echelons of the golfing elite. Anything below five is a great handicapping number, but getting to that level takes time and effort. Anyone over the 20+ score is deemed to have a high handicap, which won't take them to the US Open anytime soon.