Watched a TED Talk about this cool site that wants to bring open education to all.
Forgot about it.
Remembered i
the video a week later, checked it out.
Front page saw a course for Python for beginners.
Watched the first video.
Got hooked.
Never turned back.
Thanks Coursera :)

After that I relied more on books as the knowledge is layed out in a more concrete fashion and are probably nore revised. So better content, more accurate information, more advanced and in depth knowledge.