<Hn>Text</Hn>Where n is a number from 1 to 6. It is recommended that you use <H1> to represent main headings, <H2> tags to represent subheadings, etc.
I added some more text to the body of my document in order to show the different headings.
<HTML> <HEAD> <TITLE>My Home Page</TITLE> </HEAD> <!-- Written by me --> <!-- Created: yesterday --> <!-- Last modified: today --> <BODY> <H1>This is heading H1.</H1> <H2>This is heading H2.</H2> <H3>This is heading H3.</H3> <H4>This is heading H4.</H4> <H5>This is heading H5.</H5> <H6>This is heading H6.</H6> This is where the text goes. <ADDRESS> Written by firstname.lastname@example.org </ADDRESS> </BODY> </HTML>