Getting Started on web with firebase realtime database https://www.youtube.com/watch?v=dBscwaqNPuk&list=PLl-K7zZEsYLmnJ_FpMOZgyg6XcIGBu2OX&index=3

child.js

(function(){
  
	// Initialize firebase
 	const config = {
 	}
 	firebase.initializeApp(config);
	
	
	// Get Elements
	const preObject = document.getElementById("object");
	const uList = document.getElementById("");
	
	// Create References
	const dbRefObject = firebase.database().ref().child('Object');
	const dbRefList = dbRefObject.child("hobbies");
	
	// Sync object changes
	dbRefObject.on('value', snap => {
		preObject.innerText = = JSON.stringify(snap.val(), null, 3);
	});

	// Synch List changes
	dbRefList.on('child-added', snap => {
		const li = document.createElement('li');
		li.innerText = snap.val();
		uList.appendChild(li);

	});
})