With a few reputation points came to me the option to close off-topic questions and not just flag them.
I thought this meant flagging them was now useless and was just giving more work to people reviewing the flags.
But now I see that high reputation users go on flagging posts, or so it seems from their very high flag number. So I suppose there is a reason to keep flagging.
Is there somewhere a guide on when to close or flag (or both) off-topic questions and why ?