Can anyone explain +/- to me? Does it account for defense, too? What are the actual details used to configure the rating?
It's simply what happened while that player was on the court. Like if a player comes in and the other team hits a three instantly, he's at -3.
Precisely.
Many ppl get confused and think it is some sort of advanced stats adding everything good the player did, subtracting everything bad, then dividing it by time played etc
Nothing sophisticated here, just the score of the team while the player was on court.