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In order to avoid troubleshooting your code later on, it's important when learning HTML to focus on nesting. Nesting is the order in which HTML tags are opened, ex. <BODY>, and closed, ex. </BODY>.
The rule is this: First to open is last to close. Here's an example of improper and then the proper code:
<H3><B>This is a Headline</H3></B>
<H3><B>This is a Headline</B></H3>
Things can get much more complicated looking than this simple example, but if you remember to close tags in the opposite order than they were opened, you'll save yourself time troubleshooting.