HTML stands for hyper text mark up language.Its is used for designing the web pages for internet. Many tags are used are in it . Each tag has its own function and attribute .
<html>tag is used to start the language in notepad and </html>closing tag is used for ending up the language.
<body>tag is used for representing the text to be written in the web page.
<head>tag is used for writing the title for our web page.
Font tag is used for emphasising the text and for its physical markup.
there are too many tags. you must do practices of using html language and making web pages.