Before I did a couple of rage quits on StackOverFlow, I wanted it to be the definitive place for learning any computer topic from the beginning through advanced topic, especially esoteric topics. You could easily build the ultimate learning guide given enough questions, linking, etc.

I spent quite a bit of time on elisp questions. For example:

https://stackoverflow.com/questions/2170528/writing-hello-wo...

I think I had close to 200 questions at one point.