Couldn't...asking questions on this forum constitute "research?"
To the OP,
@pjkdog pretty much summed it up, maybe with one exception (now *I* need to do my research and I own points!)
The owner didn't use his/her 2016 points, so they were "banked." They were usable starting on 12/1/17, and must be used by 11/30/18
The 2017 points are ready to be used. Whoever the owner is or winds up being can opt to use them or bank them...but according to the DVC site right now, you have 4 months to bank your points, not 5. So since December is the use year, the owner has until the end of August to opt to bank points.
If you become the owner, and plan to book a trip this year (before the end of November), you'd use the banked points first. If that's not enough points, you could dip into your 2017 points. (Note - if you didn't want to dip into your 2017 points, DVC members are allowed to purchase "one-time-use" points, I think they're $17 a point now. You can rent up to 24 points each use year. So if you planned a trip that required 180 points but didn't want to touch the 2017 points, you could spend $340 for one-time-use points, and bank all of the 2017 points...by the end of August).
If you wanted to book a total blowout of a vacation, you could use all of the banked points from 2016, all of your 2017 points AND borrow from the 2018 points, giving you 480 to work with...or 504 if you needed any more and bought one-time-use points. And if you're careful about when and how you use them, such a trip could start at the end of November, but extend into December because only the banked 2016 points need to be used by the end of November, you'd just be banking the 2017 points so they could be used on 12/1/18 when they;d otherwise expire.
Hope that helps.