Quite a few of the questions on SO are more or less warranted requests for help with a debugging problem, often from people who give the impression of not really knowing techniques and tools to debug.
Could we have some general debugging tutorial/training/instruction material to point to?
If there were such resources, one could ask if the poster has tried the debugging techniques listed, and once they have, the community could step in with some croudsourced debugging.
The reason for this question is that often a few well-placed
printf()'s (or similar, depending on the language/platform) would help a lot to narrow down the problem. And quite some effort (usually in the comments) could be spared.
Another general tool that it would be useful for some posters to know is a debugger (again, for languages, platforms and development environments that provide one).
Instead of people walking the poster a debugging session, people wanting to help could just post a link to this generic resource. It could take the form of a few practical FAQ entries, with a few basic debugging steps for a couple of categories, for instance environments with a debugger, environments without one (many web development platforms) and HTML/CSS and friends.