Like this...

  

TextWindow.WriteLine("Hello World")

  

TextWindow is an Object
WriteLine is a Method, the brackets show that this method needs some data to work with - in this case, what to write.
"Hello World" is what we want the write and it is put in double quotes - and is called a literal since it is not a variable, but is just a value (not in a draw).

  

Read more here (article by ):

Small Basic: Grammar Basics

  

   - Ninja Ed