When a new user visits the site, and clicks into the "Your Answer" box, they are greeted with this:
Once they type in their answer, and click the "Post Your Answer" button, they are greeted with this:
How to Answer
Welcome to Stack Overflow!
Thanks for taking the time to contribute an answer. It’s because of
helpful peers like yourself that we’re able to learn together as a
community. Here are a few tips on how to make your answer great:
Pay it forward
Saying “thanks” is appreciated, but it doesn’t answer the question.
Instead, vote up the answers that helped you the most! If these
answers were helpful to you, please consider saying thank you in a
more constructive way – by contributing your own answers to questions
your peers have asked on Stack Overflow.
Have the same problem?
Still no answer to the question, and you have the same problem? Help
us find a solution by researching the problem, then contribute the
results of your research and anything additional you’ve tried as a
partial answer. That way, even if we can’t figure it out, the next
person has more to go on. It’s also possible to gain a bit of
reputation with your answers and vote up the question so it gets more
attention, or you could set a bounty on the question.
Answer the question
Read the question carefully. What, specifically, is the question
asking for? Make sure your answer provides that – or a viable
alternative. The answer can be “don’t do that”, but it should also
include “try this instead”. Any answer that gets the asker going in
the right direction is helpful, but do try to mention any limitations,
assumptions or simplifications in your answer. Brevity is acceptable,
but fuller explanations are better.
Provide context for links
A link to a potential solution is always welcome, but please add
context around the link so your fellow users will have some idea what
it is and why it’s there . Always quote the most relevant part of an
important link, in case the target site is unreachable or goes
Writing style matters
Nobody’s perfect — but answers with correct spelling, punctuation, and
grammar are easier to read. They also tend to get upvoted more
frequently. Remember, you can always go back and edit your answer to
improve it at any time.
Always be polite and have fun
It’s fine to disagree and express concern, but please be civil.
There’s a real human being on the other end of that network
connection, however misguided they may appear to be. We’re here to
learn from our peers, not yell at each other.
[Thanks, I'd like to improve my answer] [post answer as-is]
If they get through all that, they still have to get through the "Low Quality" filters. In short, people already have to work very hard to do it the wrong way nowadays.
Worth noting: This verbiage is vastly improved over the wording I saw last time I checked this.