Dart commands not running in windows 11. What do I do to make it run?

Add the path of the bin folder of the Dart SDK to the PATH environment variable of the current user (Windows key+S, type environment).

This happens if dart is not in your PATH.

1. Open cmd
2. Enter the command rundll32 sysdm.cpl,EditEnvironmentVariables
3. Double click on Path and add the location of the dart binaries you installed at the bottom of the list.
4. Close all terminal windows and reopen.