The comment line can be your best friend when designing an html page. Especially if you are new and are trying to keep your thoughts straight. I use a comment line every time i start a new section or idea in a web page. It makes for quick and easy editing.
The comment line look like this. <!-- Enter your design comment here -->
It is invisible to the browser and can only be seen when you view the source or edit the page. You can use it to separate parts of code and keep you mind straight.
Learning to use the comment can help you a lot.