Many questions have this [on hold]. What does it mean? I have not tried anything. Yes it is written using proper grammar.
It means that no answers can be added to the question - usually happens when the community votes to close the question, which can happen for different reasons (either it is off topic, doesn't make sense, difficult to understand or simply doesn't fit how the system works).
It gives the question author the chance to edit and correct the issues, so the community can reopen the question so someone could answer it.