An example. If Rudy Gobert was standing above the three point line at the top, his defender would have to stand top of the free throw line.

You could leave someone unguarded, but only if you were committed to a hard double. You couldn’t double a player without the ball.

If Jordan is posting up, you can’t double team him until the pass to him is in the air.

There are a lot of specific rules, but that gives you an idea.