We have to decide what should be our custom close reasons. We can have 3 custom close reasons. Each can be up to 400 characters.
The default format of a close reason as follows:
Questions about X are off-topic because Y. For more information, see [Z](link to meta post).
I am adding a few possible reasons below as answers. Please up-vote those which you think we should have. If you don't like the phrasing of a close reason please comment below its answer to make suggestion on how it can be improved.
Fill free to post other possible custom closing reasons. Keep in mind that we can have only 3 custom closing reasons, so should optimize to cover the frequently used clsoing reasons.
SE has changed the closing reasons and mechanism. Each site can have its own costum off-topic closing reasons. See The War of the Closes on SE blog.