Are there any context sensitive help, tooltips, etc ?

Seeing two function definitions, my first inclination was to run them on the next two lines, via

  setup();
  draw(); 

So that was wrong.

Ok, so the functions run themselves automagically.

Guessing that there must be line and circle functions, I managed to get those running.

How do I discover new stuff?

Shift - Tab is not doing anything over function signatures(Jupyter can do that in the browser sort of ok).

What would a total newbie do next without going over to Help tab?