Since this is a Q&A site on Blender, we should accept questions regarding the functions of Blender (other than too broad/tutorial requests).
However, does the community here accept questions which ask about things that are already covered in the Blender manual?
What does the "Mix" node in compositing do?
This example question seems totally on-topic here, but the answer to this example can totally be found on Blender Manual > Composite Nodes > Types > Color. In this case shall we accept the question?
There may also be some cases where the question may be answerable by the manual, but the documentation is shown to be incomplete, misleading, unclear or outdated. In this case shall we accept the question, or simply edit the manual (since it's a wiki) and then direct the question poster to the manual?
How about questions regarding things which should be in the manual but missing? (Now this part may become a little bit too broad since almost everything can be in the manual...)
For accepting a question I mean the question will be answered and not be downvoted, closed or even deleted.