I'm certain that npx react-native run-android command is to run your app on an android device. More details can be found here: reactnative.dev/docs/running-on-device
As for the command npx react-native run I don't think it's a known command by default with a React Native project, though I guess you could configure it to do something.
These are the scripts in a RN app:

Wow. This is an in-depth guide, and a good first look at using React native. It's feels like React and styled Components together. Thanks for sharing, Jome.
I will definitely learn it in my spare time.
durga shankar pandey
software developer
what is the difference between npx react-native run and npx react-native run-android