What do you think of the whole standards issue? When should you use CSS and when should you use XHTML when designing a webpage? Do you see a clear distinction or is a bit confusing to you right now? Also, how much of your previous web work was not XHTML standard-compliant?
The whole web standards issue seems like a perfectly logical conepct to me. It makes sense to have all of the web browsers follow the same standards so that everyone can view them regardless of what browser they are using.
When designing a web page, XHTML should be used to define the structure of the webpage, while CSS shall be used on top of that to define the style and appearance of the content.
I am not too confused about when to use XHTML and when to use CSS at the moment, although I have no guarantees about my comprehension in the future. It all seems so simple now, but that might be because I haven't fully absorbed it. As of now I don't feel confused on the subject matter though.
All of my previous works contained something that wasn't standards compliant. Usually it contained deprecated tags, but other than that, there were some minor typographical errors caused by careless mistakes. Besides those cases, my previous pages were standards compliant.