How do you start and end a tag in HTML?

this both are main to start and end the HTML code

<HTML>

<head>

<title>only title</title>

</head>

<hr>

<h2> Hello Friends have a nice day</h2>

<hr>

</HTML>

.. later save it has anyname.HTML and run in any browser

for more tags or any thing related HTML and css, plz send a mail to "silly.thinking@gmail.com" i will send the code to ur mail back with in 24 hrs

thks:-)

bye.........!