IPv6 is an entirely new protocol. It isn't IPv4 with larger addresses. It is new enough that you'll feel like you are starting over on a new planet; one that invented the internet using protocols that remind you of IPv4 but are.... different.
I find flashcards are a useful way to learn new terminology. I found these online:
- General IPv6 Knowledge: High level.
- Types and Ranges of IPv6 Addresses. Learn those new IP ranges!
- CCIE IPv6: Lots of technical details.