E.g. I asked the question "How to convince my colleagues to learn new technologies and programming languages?". But by hindsight I think my question was too general. What can I do about this, esp. w/o annoying the persons answering the question? I saw some questions, where questions have been closed by admin in cause of being to general, what happens to these questions?
I don't think your question was too general. I think the problem was that it doesn't match any of the categories listed in SO's FAQ:
You don't have a question about code—you have a question about people. Those are often a better fit over at programmers.se.