How to: Post Comment, not Answer
8000
How do comments work?
38709
How to prevent negative comments/downvoted being deleted by re-posting answers
31968
Why do some people answer in comments?
37700
How can I ask for clarification on a question I'd like to answer if I can't add comments?
5021
When to comment or answer
92948
Allow Comments on Deleted Answers
133049
Way to convert an answer to a comment?
5563
Asking users to accept answer when they comment that it answers their question
2428
How do I properly use the "Not an Answer" flag?
138671
Allow users to leave an anonymous comment when voting
13367
Best way to deal with questions answered by the OP in the question instead of in an answer
104116
How can I know if my post(comment, answer, question) was Flagged?
134930
Please make the multiple comment timer less annoying (non-resetting etc.)
117715
Always allow commenting on posts I have previously commented, irrespective of current rep
105685
Use comments to ask for clarification or add more information, then what?
82426
How to handle users who don't select answers for their questions?
152270
Answering comment-answered questions