Being all new to this scripting and all. After fixing all the error what does it mean. In other word what is the purpose?
Well first off, it teaches you how to better code your html.
Another thing is that as I found with this forum, bad code can have unknown effects on different browsers. So you might be able to look at your website and it seems fine to you, but little do you know, 50% of potential viewers who are trying to see your site, are getting an error message because they are using another kind of browser.