Alexei's work on this subject is very good: the best practical introduction to the subject.
However, I feel that it is worthwhile (necessary?) to completely understand the academic basis for CRDT. A good place to start is Shapiro et al's second paper : https://hal.inria.fr/inria-00555588/document .
In order (sic) to understand the paper you need to have a grasp of Order Theory. This is not terribly hard to get your head around. This is a good place to start: http://jtfmumm.com/blog/2015/11/17/crdt-primer-1-defanging-o... also https://www.wikiwand.com/en/Order_theory and basically stop when you understand this : https://www.wikiwand.com/en/Lattice_(order)
The reason why the formal basis is important is: that's the whole point of CRDT -- previously (been there, got the t-shirt..) folks just made up replication mechanisms they thought would work. Then they build them and embarked on a process of fixing the bugs. Sometimes that took decades. CRDT is nothing new in terms of : software to perform eventually consistent replication. The new thing is that there's a way to formally prove that your bright idea for replication will in fact work (as in : it will converge and it will have the consistency properties you expect). So if you're not seeing that aspect, then you're really not with the program.
btw originally the C stood for Commutative or Convergent, not Conflict-Free. There are plenty of CRDTs that cope with conflicts consistently, rather than being conflict free (e.g. LWW Register).