Q. How can I post an announcement to multiple courses at the same time?
The 'Sites & Organisations' page contains a tool called 'Qwickly' that can be used to post the same announcement to a number of courses that you are teaching.
Above: Qwickly Box on Sites & Organisations.
Above: Select courses using buttons in left box, compose your Announcement in the right, then click 'Submit'.
See the video below for demonstration:
Please note you can also use this tool to change your 'site availability' and 'send emails'.