Library: bUnit
bUnit is a testing library for .NET for testing Blazor components. It is built on top of existing popular frameworks xUnit, NUnit, and MSTests. It enables running tests on Blazor components in the same way as any other test.
Book: .NET Microservices Architecture for Containerized .NET Applications
.NET Microservices Architecture for Containerized .NET Applications is Microsoft's free e-book that describes the architecture, patterns, and best practices for building microservices based on Microsft tech stack and Azure. As the name implies, it focuses mostly on building .NET and .NET Core applications with Docker.
Book: Designing Data-Intensive Applications: The Big Ideas Behind Reliable, Scalable, and Maintainable Systems
Designing Data-Intensive Applications: The Big Ideas Behind Reliable, Scalable, and Maintainable Systems is one of my favourite computer science books. Author managed to strike a fantastic balance between academic writing and fun development book (ok, maybe not as fun as O'Reilly's Head First Book Series).