The heading tags come in pairs (opening and closing tags).
<h1> Gives the largest heading. As the heading numbers increase the heading size decreases.
The <br> tag takes you to the next line. It has no ending tag. Just type in your text in the body and put a <br> to go to the next line. As for the <hr> tag, it draw a horizontal line. This tag does not have a closing tag either. Try it!