Most IT engineers are still avoiding learning about IPv6 but as we all know, it's already here and many companies are already transitioning to an IPv6 only environment. Within the next 12 months, if you don't understand IPv6 you may find yourself unemployable.
But fear not, it's no harder to learn than IPv4 and in many ways, it's actually much easier because of its logical addressing format and plug-and-play features. In fact, I think that after time you will prefer it to IPv4.
Here's a free lecture on IPv6 addressing. I hope it helps and below the video is a link to what I consider to be the best IPv6 networking course on the internet today.
If you want a complete step-by-step guide on all aspects of IPv6 addressing, routing, network management and security then consider our Certified IPv6 Network Associate course.