Dapr for .NET Developers is a free Dapr book. You can download it from Microsoft Docs Site.
The book is similar to Learning Dapr: Building Distributed Cloud Native Applications, as an excellent introduction to Dapr. However, this book is more up-to-date with current Dapr features and practices.
The book uses Dapr 1.5 for setup & code examples.
Authors
Rob Vettor, Principal Cloud Solution Architect - thinkingincloudnative.com, Microsoft
Sander Molenkamp, Principal Cloud Architect/Microsoft MVP - sandermolenkamp.com, Info Support
Edwin van Wijk, Principal Solution Architect/Microsoft MVP - defaultconstructor.com, Info Support
I really like Edwin van Wijk's presentation for Akka.NET, a fantastic introduction to Actor Models - Edwin van WIJK: Building concurrent systems using Akka.NET @ Update Conference Prague 2018