Paragraphs add structure to a webpage because they add some space before and after them.

Add two paragraphs that group two lines per paragraph.

<html>
 <body>
  <h1>My favorite things</h1>
  <p>
   Raindrops on roses
   Whiskers on kittens
  </p>
  <p> 
   Bright copper kettles
   Warm woolen mittens
  </p>
 </body>
</html>
]]>

Always start a paragraph with an opening paragraph tag, <p>, and finish it with a closing paragraph tag, </p>.