This question already has an answer here:
I wanted to check the FAQ to see if there was a guide on giving good answers, and I couldn't find one. Am I blind? Should this be added?
What made me think of it is a common theme in bad answers I have noticed recently. Usually involving the phrase, "I'm not sure but ..." or "I think...". My thought about answers like this is: The SO community is big enough that you should never answer if you're not sure. Someone is sure, and they will answer.
It might be nice to have a guide to refer to.