[Tex/LaTex] command is not defined, fresh installation


I want to learn LaTeX and so I downloaded MacTeX, as I read that this would be the nicest solution for a Mac I am using.
Well, I opened TeXShop and inserted following source code:

Hello World

But when I click to "typeset" I get following error:

"test.tex: LaTeX Error: The font size command \normalize is not
defined: there is probably something wrong with the class file.

Do you know what to do here?
Thank you =)and sry for new be questions 😉

Best Answer

With \documentclass{article} it works for me. Had that string in there before but probably I had a typo in there so it did not work.