Answers for "ng : The term 'ng' is not recognized as the name of a cmdlet, function, script file,"

'ng' is not recognized as an internal or external command, operable program or batch file.

npm install -g @angular/cli

ng is not recognized

npm run ng <command>

ng is not recognized

Add npm path "C:\Users\{Your Name}\AppData\Roaming\npm"
to "Edit Environment variables" > "System Variables" > "Path" > "New Line"

Note: Remember, Its a hidden path on your PC. I Recommend you to enter your user_name in given path and copy paste it on file explorer to view the contents