This is excellent. I'm taking a paper engineering class right now and will learn a lot from this. Thank you for making it.
He did recommend some online resources for us to use though.
There's this youtube channel:
https://www.youtube.com/channel/UCx2M2bGHtXBszG6tuR_NIbQ
And this book:
https://www.amazon.com/dp/0689822243/
I also have this book:
https://www.amazon.com/Origami-Design-Secrets-Mathematical-M...
But find it to be very difficult. Not for beginners by any means.
That should help get you started.