How to do...

when I tried to run .net watch, I got this error:

• You intended to execute a .NET application: The application 'watch' does not exist.
• You intended to execute a .NET SDK command: No .NET SDKs were found.

Download a .NET SDK:
https://aka.ms/dotnet-download

Learn about SDK resolution:
https://aka.ms/dotnet/sdk-not-found