If you can provide an answer that solves the problem in the question, that would be great! If you have additional relevant details (e.g. the inner workings of some system mentioned in the question), that certainly wouldn't hurt to include. We have a huge audience; different people prefer different approaches. You shouldn't be downvoted for adding an answer with an alternate format, provided that it answers the question. References to relevant outside resources are very nice, but make sure to always include the applicable information from each source so your answer can stand on its own.
If you're not sure whether you can adequately answer a given question, don't worry, there are plenty of others! We get more than 150 every day, and there are tons of unanswered ones from the past. I guarantee you'll stumble upon some you can assist with.
When it comes to asking questions, our standards are a lot like Stack Overflow's. Share your research so answerers know what you already have. For troubleshooting questions, mentioning what you've already tried and what happened is a must.
In short, we'd love to have you. Feel free to post on meta with specific questions on the behavior we expect on Super User.