the heading tags

Don't confuse the three terms "head", "title" and "headings". They are all different. The headings are used within the web page in the same way as headings are used in a newspaper.

There are six heading tags:

<h1>Heading size 1<h1>         
<h2>Heading size 2<h2>
<h3>Heading size 3<h3>
<h4>Heading size 4<h4>
<h5>Heading size 5<h5>
<h6>Heading size 6<h6>

... and they look like this:

Heading size 1

Heading size 2

Heading size 3

Heading size 4

Heading size 5

Heading size 6

Exactly how they appear will depend on your browser, and how the browser preferences have been set up. Their appearance can be altered by using styles.

the attributes

The main attribute that is used with the heading tags sets the alignment. For example, this
<h3 align="center">A size 3 heading</h3>
will be displayed as:

A size 3 heading