does anyone know how can I learn Windows command prompt... is there any useful cmd course

Answer 1

I don't think there will be a course for it, but here is a list of commands:
https://www.lifewire.com/dos-commands-4070427

Answer 2

Just type help at the cmd prompt like Martin Taylor said.

& for more information on a specific command, type HELP command-name

For example:
Help Dir
or
Dir /?

Answer 3

Commands like small programs. Windows Cmd commands and linux terminal commands are different. So get the information about commands then use