Important DOM methods to get the document/doc_parts

var myVar = documnet.getElementsByClassName("content"); // returns an array of elements that has the class name "content"
var myTag = myVar[1].getElementBsyTagName("h2"); // returns an array of elements that has the class name the tag name "h2"
//can be done further operation with these returned objects, such as...
myTag[0].innerHTML("what u want to change"); // should show the changes in the node/tag
var myId =  myTag[0].getElementById("page-title"); //NOT elements such above


Important DOM properties and methods to change the document/doc_parts
var content = document.getElementById("id");
content.textContent; //gives the textcontents of the given id or
content.textContent = "I should appear";

var link = content.getAttribute("href"); //"href" the attribute u want to call
link.href // give the links that refers

content.setAttribute("href", "pi"); // replacing or adding new attributes
title.style.left = 10px; // can be accessed to the css directly


var name = document.createElement("name");

menu.appendNewChild(name);
// can be added/removed(removeChild()) and so on

title.onclick = function(){};