var myVariable = 'Bob';
Number - A number. Numbers don’t have quotes around them.
var myVariable = 10;
Boolean - A True/False value. The words true and false are special keywords in JS, and don’t need quotes.
var myVariable = true //or false
Array - A structure that allows you to store multiple values in one single reference.
var myVariable = [1,'Bob','Steve',10];
Refer to each member of the array like this:
myVariable, myVariable, etc.
var myVariable = document.querySelector('h1');