You cannot run this script on the current system. For more information
about running scripts and setting execution policy, see about_Execution_Policies

PS C:\Users\Asish\source\repos\ServiceStepApp\ServiceStep> ng serveng : File C:\Users\Asish\AppData\Roaming\npm\ng.ps1 cannot be loaded. The file C:\Users\Asish\AppData\Roaming\npm\ng.ps1 is not digitally signed. You cannot run this script on the current system. For more informationabout running scripts and setting execution policy, see about_Execution_Policies at https:/go.microsoft.com/fwlink/?LinkID=135170.At line:1 char:1 ng serve ~~ CategoryInfo… Read More

Where is TF.exe?

When you install Visual Studio, it creates a Start Menu shortcut called “Developer Command Prompt for VS YEAR” where YEAR is 2015, 2017, etc. If you launch that, and then at that prompt run where tf.exe it will give you the full path