Paragraphs
The element <P> is used to denote the start of a new paragraph. The element </P> may be used to indicate the end of a paragraph although this is not required.
Pressing the ENTER key to indicate a new line or paragraph does not work in HTML since the format of the paragraph is determined by the width of the browser view screen. The web browser formats the paragraphs automatically.
Format
<P>Text </P>
Example of paragraph use
<HTML>
<BODY>
<P>This is paragraph one</P>
<P>This is paragraph two</P>
<P>This is paragraph three</P>
</BODY>
</HTML>
Netscape displays the HTML as:

Line Breaks
The element <BR> is used to denote the start of a new line. Like the paragraph element the line break element forces the text onto a new line however a smaller gap is left between the new line and the old. Line breaks can be inserted into paragraphs between the <P> and </P> elements.
Format
Some text<BR>Some more text
Example of Line Break use
<HTML>
<BODY>
<P>This is paragraph one</P>
<P>This is paragraph two<BR>
This paragraph has some more text which starts on a new line</P>
<P>This is paragraph three which has some text which will be
automatically wrapped around the screen depending on the width
of the Netscape viewing window</P>
</BODY>
</HTML>
Netscape displays the above HTML as:

Section Headings
HTML supports six levels of section heading. The elements <H1>, <H2> ... <H6> are used to indicate the heading text. Heading <H1> is the largest and boldest with the others becoming progressively smaller. Each heading element has a corresponding close </H?> element.
The heading number does not actually imply any order within the document. In other words you could start the document with a heading level three then have a heading level one, etc.
Format
<H#>text</H#>
# should be replaced with the values 1-6 depending on the size of heading required.
Example of Heading use
<HTML>
<BODY>
<H1>Heading Level One</H1>
<H2>Heading Level Two</H2>
<H3>Heading Level Three</H3>
<H4>Heading Level Four</H4>
<H5>Heading Level Five</H5>
<H6>Heading Level Six</H6>
</BODY>
</HTML>
Netscape displays the above HTML as:

Example of Mixed Heading use
<HTML>
<BODY>
<H2>Heading Level Two</H2>
<H1>Heading Level One</H1>
<H3>Heading Level Three</H3>
<H2>Heading Level Two</H2>
<H5>Heading Level Five</H5>
<H2>Heading Level Two</H2>
</BODY>
</HTML>
Netscape displays the above HTML as: