I asked a question on the main site. One of the users suggested to edit it and delete some parts which are covered by a Wikipedia article. When I did it, one of the answerers complained that by the new version half of his answer is not useful and is irrelevant somehow.
I'm not sure what should I do now and if a part of my question is in a Wikipedia article, does it mean I cannot ask it? I saw another question which was about definition of some DB expressions and no one complained why you asked an easy question and I didn't think it was easy.
I asked four questions and had the same problem about two of them, is there any special levels for the questions or contributors that I'm not aware of?
Also I saw some unnecessary edits being done on my questions.