The new help center page now addresses answering.
How do I write a good answer? section is a start link one can provide for new users.
Additionally, we might consider building a GIS Meta thread with specific guidelines to improve answering on GIS SE.
How to answer on GIS SE?
We already started this with questions:
What makes a good question?
First to answer and accepted with score of 10 or more
is indeed ambiguous, but the clarifications offered there show that "score" is synonymous with "net upvotes," so the bounty doesn't help. (Nevertheless, although the bounty of +50 is irrelevant, with its ...