Neighborhood Guides: Grid - I am stuck here, please help


#1

 <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="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>

#2

Hi in <div class =row> try to put row like that "row"