I’m in a similar boat, except that I’m half-familiar with 2.79, and I’ve installed 2.8 early. I’m mostly here for a refresher, so 2.8 courses would have been great. However, I totally understand why they’d wait. It takes a lot of time and resources to make one of these videos, and 2.8 is still changing. So by the time they finished re-recording their tutorials for 2.8, version 2.8 might have changed significantly, and they would have to re-re-record all of them — just to update the screenshots.
I found that the following video series calls out the major differences really clearly:
https://www.youtube.com/watch?v=lPVpg4_POww
It’s not ideal, but you might find it helpful to bridge the gap, if you are impatient for 2.8 (like me). 😉