I thought it might be useful to ask a question about how to use the spoiler formatting to hopefully prompt a useful answer where someone can explain how to use spoilers when answering questions. I have seen this meta question about spoilers and another about formatting inside the spoiler system, but was wondering if this would be a useful place to put it all together and guide people to.
We could also add something about rot13 to hide stuff in comments when spoilers can't be used. Any thoughts???
Finally I am very happy for this question to be closed if people don't think it would be useful. - Also happy for someone else to open a better question.
partial answer Rot13 is a simple completely insecure coding system which is very conveniently handled by sites like rot13.com - it is helpful to be able to discuss answers to questions in comments without revealing the answer to someone who is taking a casual glance.