Microsoft supports .NET on multiple operating systems, per the Microsoft Modern Lifecycle.
Support is provided for: .NET SDK, .NET Runtimes, ASP.NET Core, and EF Core.
Support has two key benefits:
You can also request community support on GitHub (for free), but there is no guarantee on a quick reply.
Support is conditional on using the latest .NET patch update and a supported operating system, as defined by:
Knowing key dates for a product lifecycle helps you make informed decisions about when to upgrade or make other changes to your software and computing environment.