Over thirty years ago I walked into a 4-week intensive German class not even knowing that the word "Gesundheit" was a German word. Obviously I knew nothing about the German language.
The teacher I had for those 4 weeks was truly extraordinary. Her name was Dr. Pflanz.
Dr. Pflanz only spoke German during class, but it was easy to understand and make progress because of the method she used.
She didn't worry about teaching us a lot of words or phrases.