+ 3
Console.WriteLine("Hello {0}! Welcome to the {1} team!", Adam, red);
this means that the first word replaces the {0} the second word goes to the position of {1}.
Output: Hello Adam! Welcome to the red team!
you can also use variable instead of words. its really helpful if you have an input parameter like:
string name = Console.Readline();
and then the next line you want to welcome the user you can write
Console.WriteLine("Hello {0}! Thanks for using my app.", name)
hope this helps you