How to add Eventlisteners in Js?

JavaScript Conversations
#1

document.addEventListener(“event”, function);
event eg:- click,focus etc

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#2

document.addeventListener(“event”,function);
ex:-onlclick,onmouse,outmouse,overclick

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#3 
Way 1 : 
// SYNTAX : element.event = function-name
// btn.onclick = onBtnClick; //onBtnClick is eventListener here
function onDblClick () {

}
// Way 2 : 
// SYNTAX : element.addEventListener(event,function-name);
btn.addEventListener('click',onBtnClick);
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