@dotnet – This is the official YouTube channel for the .NET team at Microsoft.
@CoderFoundry – We're a coding bootcamp providing immersive training in the Microsoft .NET stack.
@MicrosoftDeveloper – Official Microsoft Developer YouTube channel! Featuring live events, tips and tutorials, product news and more to help you explore, discover, and build solutions - using your favorite languages, technologies, and open-source frameworks.
Source
.NET Platform – Home of the open source .NET platform