the best way to learn about web design would be to go on a course - call your local college for a prospectus for its new media courses. Alternatively there are some courses you can do online to get you started Webmonkey is the best place to start (http://hotwired.lycos.com.webmonkey)
it offers basic tutorials in web design and you can learn more on actual courses and internet skills at http://webdesign.about.com/compute/webdesign.
There are many online web designing tutorials available on the internet from where you can easily learn the concept of good web designing. I will recommend you to visit w3schools.com - web design tutorial.
The best way to learn web designing is to read informative blogs and keep yourself updated. I've used http://www.3wedge.com/ to get myself about latest designing trends.