$(document).ready()

For jQuery to load properly we want to make sure that the document which is the html or the DOM file loads fully first.  Incasing your jQuery in $(document).ready() tells jQuery to hold up and wait its turn.

Here's an example:

//wait till the document file has loaded then executes a function (with no parameters)

$(document).ready(function() {

//print out "Hello" to the console.

  console.log("Hello");

//close

})

You can also do the short hand.

//the (document).ready is optional. 

$(function() {

  console.log("Hello");

})