How do I use jQuery in Ruby on Rails 3.2? -

I am a newbie in the Rail on Ruby and we have to know what we need to use in Ruby on Rails application JQuery

I have this in my watch page:

  & lt; Script type = "text / javascript" src = "https: // ajax .googleapis.com / ajax / libs / jQuery / 1.7.2 / jquery.min.js" & gt; & Lt; / Script & gt; & Lt;% = javascript_include_tag "Application"% & gt; & Lt; Script & gt; Warning ("Hussein") Warning ($ ('$ hussi'). Val ()) & lt; / Script & gt;   
 This gives the first warning as expected, but for the second warning this '$' is not defined.  
 I have jquery-rails gem installed. / P> 
 The browser indicates that I have a mistake reference in my  application.js  file.  
  requires jquery; Requires Jquery_ujs;   
 I saw some file examples where they mention it like this:  
  = jquery is required; = Required jquery_ujs;   
 But raises an IDE error in my IDE by adding '='.   
 
 
 Add it to application.js:  
  // Essentials Jquery // essential jquery_ujs   
 and add it to your Gemfile:  
  gem 'jquery-rails'   
 Also make sure that you have this app in the layout:  
  <% = Javascript_include_tag "app"%>   
 Just a note: Avoid using tags in your code, move your javascript to your property folder.