Answers for "what is a event listener js"

javascript onclick event listener

document.getElementById("myBtn").addEventListener("click", function() {
  alert("Hello World!");
});

event listener javascript

const element = document.querySelector(".class__name");

element.addEventListener("click", () => {
	console.log("clicked element");
});

javascript event listener

element.addEventListener("click", function(){ 
   element.innerText = "something"; 
});