.NET
ASP.NET
Books
Video Courses
Effective Logging in ASP.NET Core
Understanding ASP.NET Core Security
Concurrency
Books
Concurrency in C# Cookbook, 2nd Edition
Concurrency in .NET
Resources
Threading in C#, by Joe Albahari
.NET Internals
Books
Pro .NET Memory Management: For Better Code, Performance, and Scalability
Pro .NET Performance
Advanced .NET Debugging
Videos
WinDbg Superpowers for .NET Developers - Sasha Goldshtein
PerfView: The Ultimate .NET Performance Tool
More on AsyncHub - .NET Internals…
Video Courses
C# Language Internals - Part 1
C# Language Internals - Part 2
Event Tracing for Windows (ETW) in .NET
.NET Debugging for the Production Environment on Channel 9
Defrag Tools #113 - PerfView Part 1 on Channel 9
Articles
ConfigureAwait FAQ
.NET async/await in a single picture
Resources
Unit Testing
Books
Unit Testing Principles, Practices, and Patterns
The Art of Unit Testing, 2nd Edition
Videos
Pragmatic Unit Testing - Vladimir Khorikov
Articles