how to change a data in firebase' code example

Example 1: how to set data in firebase

var playersRef = firebase.database().ref("players/");

playersRef.set ({
   John: {
      number: 1,
      age: 30
   },
	
   Amanda: {
      number: 2,
      age: 20
   }
});

Example 2: firebase update data

await firebase.database().ref().update(updates);