If you re-use the work you must always note the author, licence (CC BY) and source (URL).
You can use this template:
This work by <your name> (<your institution>), is a derivative of work by <authors (and institutions) and> Moodle Academy (Moodle Pty Ltd). Licensed under CC BY 4.0. Original resources available at https://moodle.academy.
Example:
This work by Joe Bloggs, (Mount Orange) is a derivative of work by Andy Sims (Orange University) and Moodle Academy (Moodle Pty Ltd). Licensed under CC BY 4.0. Original resources available at https://moodle.academy.