I'm genuinely asking. As far as New 52 goes, what are the major takeaways?
Briefly: I was pretty hardcore into DC comics from the lead-up to Infinite Crisis (circa the Geoff Johns Green Lantern: Rebirth) up until New 52. I stopped reading monthly titles when New 52 hit because I hated the whole concept (plus, I was in law school and didn't have a lot of time).
Now that the New 52 era has come to a close, I want to jump back in for all the Rebirth stuff. I've already read some of it, but I'm just wondering if there are a few major things to know about from the New 52 era that are relevant to Rebirth (for instance, why is Superman missing?) and some brief background on what I need to know.
I'm well-versed in general DCU continuity and history, so you can assume I speak the language. I've just been a little out of the loop for a few years! Any help would be much appreciated.