Problem with Bootstrap 5,6,7 exercises + Learn More section doesn't split properly


#1

This code shows the website properly, except Learn More part (The field doesn't split on 3 parts)
Meanwhile I cannot pass Bootstrap 5,6,7 exercises.
Please explain to me my mistake.
I am stuck((

Update
Learn more part is solved thanks to leonhard.wettengmx.n help.
I leave the code not fixed for history.

Though it is still problem with 5,6,7 exercises.
Please help!

<!DOCTYPE html>
<html>

  <head>
    <link href="http://s3.amazonaws.com/codecademy-content/courses/ltp/css/shift.css" rel="stylesheet">
    <link rel="stylesheet" href="http://s3.amazonaws.com/codecademy-content/courses/ltp/css/bootstrap.css">
    <link rel="stylesheet" href="main.css">
    
  </head>

  <body>
    <div class="nav">
      <div class="container">
      <ul class="pull-left">
          <li><a href="#">Name</a></li>
          <li><a href="#">Browse</a></li>
      </ul>
      <ul class="pull-right">
          <li><a href="#">Sign Up</a></li>
          <li><a href="#">Log In</a></li>
          <li><a href="#">Help</a></li>
      </ul>
      </div>
    </div>

    <div class="jumbotron">
      <div class="container">
        <h1>Find a place to stay.</h1>
        <p>Rent from people in over 34,000 cities and 192 countries.</p>
        <a href="#">Learn More</a>
      </div>
    </div> 
    
    <div class="neiborhood-guides">
       <div class="container">
          <h2>Neiborhood Guides</h2>
          <p>Not sure where to stay? We've created neiborhood guides for cities all around the world."</p>
       
            <div class="row">
               <div class="col-md-4">
                 <div class="thumbnail">
                    <img src="http://goo.gl/0sX3jq">
                 </div>
                 
                 <div class="thumbnail">
                    <img src="http://goo.gl/an2HXY">
                 </div>
               </div>
         
               <div class="col-md-4">
                 <div class="thumbnail">
                    <img src="http://goo.gl/Av1pac">
                 </div>
                 <div class="thumbnail">
                    <img src="http://goo.gl/vw43v1">
                 </div>
               </div>
               
               <div class="col-md-4">
                 <div class="thumbnail">
                    <img src="http://goo.gl/0Kd7UO">
                 </div>
               </div>
           </div>
        </div>
   </div>


 <div class="learn-more">
   <div class="container">
	      <div class="row">
	             <div class="col-md_4">
		        	<h3>Travel</h3>
		        	<p>From apartments and rooms to treehouses and boats: stay in unique spaces in 192 countries.</p>
		        	<p><a href="#">See how to travel on Airbnb</a></p>
	             </div>
	             <div class="col-md-4">
		        	<h3>Host</h3>
		        	<p>Renting out your unused space could pay your bills or fund your next vacation.</p>
		        	<p><a href="#">Learn more about hosting</a></p>
		         </div>
		         <div class="col-md-4">
		        	<h3>Trust and Safety</h3>
		        	<p>From Verified ID to our worldwide customer support team, we've got your back.</p>
		        	<p><a href="#">Learn about trust at Airbnb</a></p>
	            </div>
	      </div>
   </div>
  </div>
 </body>
</html>

Thank you


#2

@arrayninja81651,

Have a close look at

"col-md_4"


#3

thank you, works properly now