Feel free to fork these slides and modify for your own purposes. Just remember to remove the Monash University branding from the first slide.
Slides for the 2nd edition of the book are available in this 2018 release: https://github.com/robjhyndman/ETC3550Slides/releases/tag/2018
Slides for the 3rd edition of the book are available in this 2022 release: https://github.com/robjhyndman/ETC3550Slides/releases/tag/2022
The slides used in the online videos are available at https://github.com/robjhyndman/fpp3_slides