http://www.w3schools.com/[
^] has tutorials written by the people who define the web standards. Assuming you are a beginner , working through the HTML/CSS and javascript tutorials will be invaluable. They also provide
ASP.NET[
^] tutorial, if you are interested in that, but once you've got to grips with the basics you'll be better off working on a project of your own and solving the problems that will inevitably arise! Note that you might want to investigate other web-technologies such as PHP, JSP or Ruby on Rails to name but a few, they are all very different and have their own strengths and weaknesses.
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