Codecademy - Practising CSS (Example 1 - HTML Code)

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title>Missing Semicolons</title>
    <link rel="stylesheet" href="style.css">
  </head>
  <body>
    <h3>CSS Tips and Tricks</h3>
    <p class="tips" id="one">
      Use classes when you have a elements that share many similar characteristics.
    </p>
    <p class="tips" id="two">
      Use an ID when you have one element that has unique characteristics.
    </p>
    <p class="tips" id="three">
      Keep your code D.R.Y. (Don't Repeat Yourself!).
    </p>
    <p class="tips" id="four">
      Double check your syntax: End declarations with semicolons(;) and check that properties exist!
    </p>
  </body>
</html>