Rules are kinda complex
https://www.espn.com/nba/story/_/id/38392750/source-nba-board-governors-approve-tougher-rest-rule
- Teams must manage their roster to ensure that no more than one star player is unavailable for the same game. For example, the Boston Celtics would not be allowed to rest both Jaylen Brown and Jayson Tatum in the same game unless they are both injured.
- Teams must ensure that star players are available for nationally televised and in-season tournament games.
- Teams must refrain from any long-term shutdown -- or near shutdown -- when a star player stops participating in games or plays in a materially reduced role in circumstances affecting the integrity of the game. Under that scenario, the Washington Wizards and Portland Trail Blazers would've been investigated by the league after shutting down Bradley Beal (10 games) and Damian Lillard (11), respectively, at the end of last season.
- Teams must maintain a balance between the number of one-game absences for a star player in home games and road games -- with a preference for those absences to happen in home games.
- Teams must ensure that healthy players resting for a game are present and visible to fans.