Fun indeed! I started the tutorial and put myself into "ignorant mode", trying not to anticipate anything. That got me stuck at the point shown in the attached picture. Why is the string shown in red and in double quotes on the stage, if it's blue and in single quotes in the source editor and in the explanatory text?
Also: "They evaluate to 'hello'" isn't very useful as an explanation to me. First of all, "evaluate" is a transitive verb in non-technical English. But even if I accept its CS usage, the sentence seems to claim that all Text evaluates to "hello".