Exercise 2 on page 3 is particularly useful. You will see how the source code for a Dreamweaver document differs from the "vanilla" HTML that you have been creating.
The first and last paragraphs on page 5 warrant special attention. READ THEM!
The paragraph about web page layout at the bottom of page 7 also warrants your attention.
The section about download times on page 8 is good general advice when developing your web pages in the future.
There are six appendices that show how the same page is rendered differently using the various browsers and platforms. The point is that you must take care to develop general, consistently rendered pages. More on this as you progress.