Unable to access Python after successful Installation (New User)

Dear all, I am new to Python world, I don’t know anything, I am first time learning this language.
I successfully installed Python from Python website, but I am unable to access it via command prompt. I don’t know what to type on command prompt. please help.

Because you say “command prompt”, I assume you are on Windows, is this correct?

So, you ran the installer and got a success message?

What happens if you try python in the command prompt?

What happens if you try py in the command prompt?

Please also check this reference from the official documentation: