Learning HTML and XHTML
The web is built on HTML. It is its foundation. Therefore it is very important that you understand it inside out if you want to be a web designer/developer. Thankfully the web is full of great resources to help you along the way.
Here is some of the best:
Tizag has some very easy to follow HTML tutorials which are perfect for beginners.
W3 Schools has excellent and comprehensive tutorials on HTML and XHTML (the latest version of HTML).
HTML Code Tutorial
Broken into logical sections, HTML Code Tutorial is another great HTML resource.
W3 Validation Service
Once you have learnt the basics, you will want to put an HTML page together. In order to ensure you have done everything correctly, you should validate your code using the World Wide Web Consortium's HTML Validation Service. This will ensure that your code complies with the latest web standards. You want check a live URL, upload an HTML file or copy and paste your HTML code.