<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<link href="style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<table class="container">  
  <table class="content">
    		<h1><img src="207949_1014412613249_1613093370_31441_3744_n.jpg" width="604" height="453" alt="my picture" /></h1>
    		<h1>Καλωσήρθατε!!!!</h1>
   			<p>
             Ονομάζομαι και αυτή είναι η πρώτη μου Ιστοσελίδα.
            </p>
    			
                <h2>About me!!!</h2>
    				<p>
                    	Είμαι τελειόφοιτος φοιτητής το
                    </p>        				
                    	<h2>Προσωπικά ενδιαφέροντα</h2>
         				<p>
         					<ul>
         						<li>Ενασχόληση με προιόντα Apple.</li>
         						<li>Κινηματογράφος.</li>
         						<li>Ποδόσφαιρο.</li>
         						<li>Αυτοκίνητα.</li>
         						<li>Ταξίδια.</li>
                            </ul>
                        </p>         
           	<table>
          	<h2>Γνώσεις Λογισμικών</h2>
<tr>
<td>Λογισμικά</td><td>Έκδοση</td></tr>
<tr>
<td>Adobe Dreamweaver Cs</td><td>5.0</td></tr>
<tr>
<td>Microsoft Visual Studio</td><td>2008</td></tr>
<tr>
<td>Borland C++ Builder</td><td>6.0</td></tr>
			</table>
          
          
          <h2>Επικοινωνία</h2>
          <p>E-mail:gmail.com</p>           							
	
	 </table>
</table>
    
</body>
</html>

i have tried but i cannot make it validate at w3c.Please help

<table>
<h2>Γνώσεις Λογισμικών</h2>
<tr>

Nothing goes between a table and a tr except (maybe) the optional tbody.
Put that h2 above the table or in a cell in the table.

Also

<table class="container">
<table class="content">

have no rows or cells. Again - tables have rows and cells and nothing in a table can be outside a cell. Turn those two table tags into divs as they appear to be for styling and positioning, not tabular data.

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