I recently ran a hands-on training session for Girls Code MK on how to use Git and GitHub.
The slides from the presentation are below, but they probably won't make a great deal of sense stand-alone (I do a lot of talking around the slides when I'm presenting, and a lot of the workshop was the participants trying out stuff).
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There are some more links on the last page of Part 4.
Cover image from Wikimedia commons.
Slides prepared with remark.