Web design only? Find a list of design contest winners and study them. Determine what you like and dislike, what makes them appealing ... start designing. You will develop your own style over time.
This is assuming you have a general design background to begin with.
That is a bit like saying what is the best car. A good place to start would be http://www.good-tutorials.com/. There are hundreds of thousands of tutorials throughout the web. I would suggest using Google to search for web design tutorials and see what comes up. After looking at a lot of them you will soon see which are better.
If you want a complete web design tutorial for using Photoshop web site templates, then check out www.templateconnection.com/free-templates . You can download 10 free photoshop templates and then receive video tutorials to your e-mail showing you how to customize and edit these templates. This is a really good way to get involved and start learning.
Another great resource is http://www.w3schools.com . You can pretty much pick up the basics of internet programming languages, try examples, and start implementing what you learn into your own web site.
There are so many sites available which provide grate tutorial based on website designing. Web design is a pleasure and people enjoy designing and developing sites with these simple tutorials and tips
there is no best web design tutorial, just most suitable for you.
you can go to google or yahoo to find web design tutorial, there are so much useful web resources.
after you are sure it is suitable for you , you can buy one.