The print function is one of the most frequently used parts of Perl. It takes a list of things to output as its parameters. The only thing you need to know is that you never insert commas or spaces into numbers in Perl. Strings are a bit more complex. If functions are Perl's verbs, then variables are its nouns.
Scalars are single things.
This might be a number or a string. We the People, etc. The conversion happens automatically. If you use a double-quoted string, Perl will insert the value of any scalar variables you name in the string. These manipulate a scalar's value without needing two elements in an equation.