How to Determine Who Counts as a Back Court Player

The Oklahoma City Thunder have a J. Gildes Alexander, he's a guard and then Jalen Williams,. The perimeter Jalen Williams was a guard and I also thought Josh Giddy was a guard. So like for teams like this, how do you go ahead and determine who actually counts as their back court? We'll probably just stick with maybe like basketball references estimates at how many minutes they play. But there's just going to be clearly some players.