Yet more evidence… those that can’t do, teach.
Sounds like your instructor has difficulty articulating his thoughts.
In NH, and I feel confident saying this is common, when two motorists stop at a 4-way-stop intersection or an unmarked intersection at the same time, the car on the right has the right of way. Since by definition all other intersections are marked, follow the signs/lights.
In rotaries, it varies. Generally here in the U.S. the vehicle already in the rotary has the right of way.
Except in California. In CA, whoever has the biggest firearm has the right of way.
Sorry. Couldn’t resist. Saw “LA Story” recently.