# When may one post responses that aren't direct answers?

Recently, this question was asked on math.SE. I had originally thought the subject was the definition of the modulus $| \cdot | : \mathbb{C} \to \mathbb{R^+}$, so I posted the shortcut for solving the equation as a comment so as not to be accused of not answering the question as has happened to others before.

When is it acceptable to post information or thoughts that are only related to a question rather than direct answers? I very much enjoy this site and would like to post more often, but it's difficult to get started here or anywhere when you keep holding back until you're confident both that your answer is correct and that it won't be considered inappropriate or not what one was looking for.