Some of you may be aware that my new book for Packt Publishing is out! It is titled Entity Framework Core Cookbook - Second Edition because it was meant to be the second edition of Entity Framework 4.1: Expert’s Cookbook. In fact, it is mostly a full rewrite.
It is organized in chapters:
Chapter 1: Improving Entity Framework in the Real World
Chapter 2: Mapping Entities
Chapter 3: Validation and Changes
Chapter 4: Transactions and Concurrency Control
Chapter 5: Querying
Chapter 6: Advanced Scenarios
Chapter 7: Performance and Scalability
Appendix: Pitfalls
When I started writing it, .NET Core was still in early RC1. Things changed a lot from RC1 to RC2 and then again to RTM, so I had to revisit all chapters in the end. It was a pity that EF Core 1.1 was released shortly after the book was closed, because I could have talked about it too. Also, there are things that I could have covered, like extending Entity Framework Core, but there were so many of them! 
Maybe in a future time!
Those of you who are interested can get a copy from the Pack Publishing site or from other sellers, either as an e-book or in hardcopy.
I want to thank everyone at Packt Publishing, namely Chaitanya Nair, Merint Mathew and Siddhi Chavan for their professionalism and support!