1jQuery(document).ready(function($){
2
3    // jQuery code is in here
4
5});

1    <script src="https://code.jquery.com/jquery-3.1.1.min.js" integrity="sha384-3ceskX3iaEnIogmQchP8opvBy3Mi7Ce34nWjpBIwVTHfGYWQS9jwHDVRnpKKHJg7" crossorigin="anonymous"></script>
2

1(function($){
2
3  $(document).ready(function(){
4      // write code here
5  });
6
7  // or also you can write jquery code like this
8
9  jQuery(document).ready(function(){
10      // write code here
11  });
12
13})(jQuery);
14