Help me in solving HTML12 problem

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what is wrong in the code i wrote

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// your code goes here
<body>
    <!-- Type your code below this line -->
   <h2> <b>About Greece </b></h2>
    <br>
   <h2> <u> Greece </u> offcially the Hellenic Republic is a country in south East Europe.<br>Greece has the longest cosatline on the Mediterranean Basin, featuring thousands of islands.</h2>
   <br>
   <h2> <b> Importance of Greece </b></h2>
   <br>
   <h2> <i> Greece is considered the cradle of Western civilization, being the birthplace of democracy, Western philosophy, Western literature, historiography, political science, major scientific and mathematical principles, theatre and the Olympic Games.</i></h2>
    
</body>

Learning course: Learn HTML / CSS
Problem Link: Recap Practice Problem in HTML / CSS - CodeChef

About Greece


Greece offcially the Hellenic Republic is a country in south East Europe.
Greece has the longest cosatline on the Mediterranean Basin, featuring thousands of islands.

Importance of Greece


Greece is considered the cradle of Western civilization, being the birthplace of democracy, Western philosophy, Western literature, historiography, political science, major scientific and mathematical principles, theatre and the Olympic Games.

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