In the image below its says " If that file was called
hello.py , we could run it from the command-line like this: ". How do i run this program?
This might seem kinda dumb but i first make a file called hello.py and in it wrote print(“howdy user”). Then i created a new file in the same folder and in it wrote $ python3 hello.py and ran it and it failed to run. What exactly am i supposed to do here and what exactly is a command-line?