Web Development

So, I've decided to learn a little about web development in my spare time since I figured it might be fun to do in my spare time and useful in the future. I have been trying to find some good resources on the subject, and have started using:
http://www.w3schools.com/default.asp
I haven't read a lot of it but it seems good thusfar. Any thoughts/advice on good resources (especially free internet-based ones) to learn about Web Development, or just advice on the topic in general for a beginner such as myself?
(also, I've been programming in other languages like C and python for awhile now so this isn't my first time programming, just in case that's important)

>>3

Sure, HTML to start, but HTML is fairly easy from my understanding, so hopefully it shouldn't take long to learn. I want to learn everything I can about making webpages, so Javascript and CSS and XML, SQL, and the like should be part of my learning too, right? Really, anything I can learn to make any kind of web page that I might need. Lets say, I'd like to learn everything I'd need to know to be able to make web pages that people could actually pay me to make for them, to make it simple.